--- a/mobile/android/base/java/org/mozilla/gecko/db/BrowserContract.java
+++ b/mobile/android/base/java/org/mozilla/gecko/db/BrowserContract.java
@@ -222,18 +222,16 @@ public class BrowserContract {
 
     @RobocopTarget
     public static final class Visits implements CommonColumns, VisitsColumns {
         private Visits() {}
 
         public static final String TABLE_NAME = "visits";
 
         public static final Uri CONTENT_URI = Uri.withAppendedPath(AUTHORITY_URI, "visits");
-        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/visits";
-        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/visits";
     }
 
     // Combined bookmarks and history
     @RobocopTarget
     public static final class Combined implements CommonColumns, URLColumns, HistoryColumns, FaviconColumns  {
         private Combined() {}
 
         public static final String VIEW_NAME = "combined";

--- a/mobile/android/services/src/main/java/org/mozilla/gecko/fxa/receivers/FxAccountDeletedService.java
+++ b/mobile/android/services/src/main/java/org/mozilla/gecko/fxa/receivers/FxAccountDeletedService.java
@@ -8,17 +8,16 @@ import java.util.concurrent.Executor;
 
 import org.mozilla.gecko.background.common.log.Logger;
 import org.mozilla.gecko.background.fxa.oauth.FxAccountAbstractClient;
 import org.mozilla.gecko.background.fxa.oauth.FxAccountAbstractClientException.FxAccountAbstractClientRemoteException;
 import org.mozilla.gecko.background.fxa.oauth.FxAccountOAuthClient10;
 import org.mozilla.gecko.fxa.FxAccountConstants;
 import org.mozilla.gecko.fxa.sync.FxAccountNotificationManager;
 import org.mozilla.gecko.fxa.sync.FxAccountSyncAdapter;
-import org.mozilla.gecko.sync.repositories.android.AndroidBrowserHistoryDataExtender;
 import org.mozilla.gecko.sync.repositories.android.ClientsDatabase;
 import org.mozilla.gecko.sync.repositories.android.FennecTabsRepository;
 
 import android.app.IntentService;
 import android.content.Context;
 import android.content.Intent;
 
 /**
@@ -82,32 +81,16 @@ public class FxAccountDeletedService ext
         if (db != null) {
           db.close();
         }
       }
     } catch (Exception e) {
       Logger.warn(LOG_TAG, "Got exception deleting the Firefox Sync clients database; ignoring.", e);
     }
 
-    // Clear Firefox Sync history data table.
-    try {
-      Logger.info(LOG_TAG, "Deleting the Firefox Sync extended history database.");
-      AndroidBrowserHistoryDataExtender historyDataExtender = null;
-      try {
-        historyDataExtender = new AndroidBrowserHistoryDataExtender(context);
-        historyDataExtender.wipe();
-      } finally {
-        if (historyDataExtender != null) {
-          historyDataExtender.close();
-        }
-      }
-    } catch (Exception e) {
-      Logger.warn(LOG_TAG, "Got exception deleting the Firefox Sync extended history database; ignoring.", e);
-    }
-
     // Remove any displayed notifications.
     new FxAccountNotificationManager(FxAccountSyncAdapter.NOTIFICATION_ID).clear(context);
 
     // Bug 1147275: Delete cached oauth tokens. There's no way to query all
     // oauth tokens from Android, so this is tricky to do comprehensively. We
     // can query, individually, for specific oauth tokens to delete, however.
     final String oauthServerURI = intent.getStringExtra(FxAccountConstants.ACCOUNT_OAUTH_SERVICE_ENDPOINT_KEY);
     final String[] tokens = intent.getStringArrayExtra(FxAccountConstants.ACCOUNT_DELETED_INTENT_ACCOUNT_AUTH_TOKENS);

deleted file mode 100644
--- a/mobile/android/services/src/main/java/org/mozilla/gecko/sync/repositories/android/AndroidBrowserHistoryDataExtender.java
+++ /dev/null
@@ -1,187 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-package org.mozilla.gecko.sync.repositories.android;
-
-import java.util.ArrayList;
-
-import org.json.simple.JSONArray;
-import org.mozilla.gecko.background.common.log.Logger;
-import org.mozilla.gecko.sync.repositories.NullCursorException;
-import org.mozilla.gecko.sync.repositories.domain.HistoryRecord;
-
-import android.content.ContentValues;
-import android.content.Context;
-import android.database.Cursor;
-import android.database.SQLException;
-import android.database.sqlite.SQLiteDatabase;
-
-public class AndroidBrowserHistoryDataExtender extends CachedSQLiteOpenHelper {
-
-  public static final String LOG_TAG = "SyncHistoryVisits";
-
-  // Database Specifications.
-  protected static final String DB_NAME = "history_extension_database";
-  protected static final int SCHEMA_VERSION = 1;
-
-  // History Table.
-  public static final String   TBL_HISTORY_EXT = "HistoryExtension";
-  public static final String   COL_GUID = "guid";
-  public static final String   GUID_IS = COL_GUID + " = ?";
-  public static final String   COL_VISITS = "visits";
-  public static final String[] TBL_COLUMNS = { COL_GUID, COL_VISITS };
-
-  private final RepoUtils.QueryHelper queryHelper;
-
-  public AndroidBrowserHistoryDataExtender(Context context) {
-    super(context, DB_NAME, null, SCHEMA_VERSION);
-    this.queryHelper = new RepoUtils.QueryHelper(context, null, LOG_TAG);
-  }
-
-  @Override
-  public void onCreate(SQLiteDatabase db) {
-    String createTableSql = "CREATE TABLE " + TBL_HISTORY_EXT + " ("
-        + COL_GUID + " TEXT PRIMARY KEY, "
-        + COL_VISITS + " TEXT)";
-    db.execSQL(createTableSql);
-  }
-
-  @Override
-  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-    // For now we'll just drop and recreate the tables.
-    db.execSQL("DROP TABLE IF EXISTS " + TBL_HISTORY_EXT);
-    onCreate(db);
-  }
-
-  public void wipe() {
-    SQLiteDatabase db = this.getCachedWritableDatabase();
-    onUpgrade(db, SCHEMA_VERSION, SCHEMA_VERSION);
-  }
-
-  /**
-   * Store visit data.
-   *
-   * If a row with GUID `guid` does not exist, insert a new row.
-   * If a row with GUID `guid` does exist, replace the visits column.
-   *
-   * @param db The database to write to; must not be null.
-   * @param guid The GUID to store to; must not be null.
-   * @param visits New visits data.
-   */
-  protected void store(SQLiteDatabase db, String guid, JSONArray visits) {
-    ContentValues cv = new ContentValues();
-    cv.put(COL_GUID, guid);
-    if (visits == null) {
-      cv.put(COL_VISITS, "[]");
-    } else {
-      cv.put(COL_VISITS, visits.toJSONString());
-    }
-
-    String[] args = new String[] { guid };
-    int rowsUpdated = db.update(TBL_HISTORY_EXT, cv, GUID_IS, args);
-    if (rowsUpdated >= 1) {
-      Logger.debug(LOG_TAG, "Replaced history extension record for row with GUID " + guid);
-    } else {
-      long rowId = db.insert(TBL_HISTORY_EXT, null, cv);
-      Logger.debug(LOG_TAG, "Inserted history extension record into row: " + rowId);
-    }
-  }
-
-  /**
-   * Store visit data.
-   *
-   * If a row with GUID `guid` does not exist, insert a new row.
-   * If a row with GUID `guid` does exist, replace the visits column.
-   *
-   * @param guid the GUID to store; must not be null.
-   * @param visits new visits data.
-   */
-  public void store(String guid, JSONArray visits) {
-    SQLiteDatabase db = this.getCachedWritableDatabase();
-    store(db, guid, visits);
-  }
-
-  /**
-   * Store (update or insert) visit data in a single database transaction.
-   */
-  public void bulkInsert(ArrayList<HistoryRecord> records) {
-    SQLiteDatabase db = this.getCachedWritableDatabase();
-    try {
-      db.beginTransaction();
-
-      for (HistoryRecord record : records) {
-        store(db, record.guid, record.visits);
-      }
-
-      db.setTransactionSuccessful();
-    } catch (SQLException e) {
-      Logger.error(LOG_TAG, "Caught exception in bulkInsert new history visits.", e);
-    } finally {
-      db.endTransaction();
-    }
-  }
-
-  /**
-   * Fetch a row.
-   *
-   * @param guid The GUID of the row to fetch.
-   * @return A Cursor.
-   * @throws NullCursorException
-   */
-  public Cursor fetch(String guid) throws NullCursorException {
-    String[] args = new String[] { guid };
-
-    SQLiteDatabase db = this.getCachedReadableDatabase();
-    Cursor cur = queryHelper.safeQuery(db, ".fetch",
-        TBL_HISTORY_EXT, TBL_COLUMNS, GUID_IS, args);
-    return cur;
-  }
-
-  public JSONArray visitsForGUID(String guid) throws NullCursorException {
-    if (guid == null) {
-      Logger.warn(LOG_TAG, "Asked for visits for null GUID.");
-      return new JSONArray();
-    }
-
-    Logger.debug(LOG_TAG, "Fetching visits for GUID " + guid);
-    Cursor visits = fetch(guid);
-    try {
-      if (!visits.moveToFirst()) {
-        // Cursor is empty.
-        return new JSONArray();
-      } else {
-        return RepoUtils.getJSONArrayFromCursor(visits, COL_VISITS);
-      }
-    } finally {
-      visits.close();
-    }
-  }
-
-  /**
-   * Delete a row.
-   *
-   * @param guid the GUID of the row to delete.
-   * @return The number of rows deleted, either 0 (if a row with this GUID does not exist) or 1.
-   */
-  public int delete(String guid) {
-    String[] args = new String[] { guid };
-
-    SQLiteDatabase db = this.getCachedWritableDatabase();
-    return db.delete(TBL_HISTORY_EXT, GUID_IS, args);
-  }
-
-  /**
-   * Fetch all rows.
-   *
-   * @return a <code>Cursor</code>.
-   * @throws NullCursorException
-   */
-  public Cursor fetchAll() throws NullCursorException {
-    SQLiteDatabase db = this.getCachedReadableDatabase();
-    Cursor cur = queryHelper.safeQuery(db, ".fetchAll", TBL_HISTORY_EXT,
-        TBL_COLUMNS,
-        null, null);
-    return cur;
-  }
-}

--- a/mobile/android/tests/background/junit3/background_junit3_sources.mozbuild
+++ b/mobile/android/tests/background/junit3/background_junit3_sources.mozbuild
@@ -6,20 +6,18 @@
 
 background_junit3_sources = [
     'src/org/mozilla/gecko/background/common/TestAndroidLogWriters.java',
     'src/org/mozilla/gecko/background/common/TestBrowserContractHelpers.java',
     'src/org/mozilla/gecko/background/common/TestUtils.java',
     'src/org/mozilla/gecko/background/common/TestWaitHelper.java',
     'src/org/mozilla/gecko/background/db/AndroidBrowserRepositoryTestCase.java',
     'src/org/mozilla/gecko/background/db/TestAndroidBrowserBookmarksRepository.java',
-    'src/org/mozilla/gecko/background/db/TestAndroidBrowserHistoryDataExtender.java',
     'src/org/mozilla/gecko/background/db/TestAndroidBrowserHistoryRepository.java',
     'src/org/mozilla/gecko/background/db/TestBookmarks.java',
-    'src/org/mozilla/gecko/background/db/TestCachedSQLiteOpenHelper.java',
     'src/org/mozilla/gecko/background/db/TestClientsDatabase.java',
     'src/org/mozilla/gecko/background/db/TestClientsDatabaseAccessor.java',
     'src/org/mozilla/gecko/background/db/TestFennecTabsRepositorySession.java',
     'src/org/mozilla/gecko/background/db/TestFormHistoryRepositorySession.java',
     'src/org/mozilla/gecko/background/db/TestPasswordsRepository.java',
     'src/org/mozilla/gecko/background/db/TestTopSites.java',
     'src/org/mozilla/gecko/background/fxa/authenticator/TestAccountPickler.java',
     'src/org/mozilla/gecko/background/fxa/TestAccountLoader.java',

--- a/mobile/android/tests/background/junit3/instrumentation.ini
+++ b/mobile/android/tests/background/junit3/instrumentation.ini
@@ -1,20 +1,18 @@
 [DEFAULT]
 subsuite = background
 
 [src/org/mozilla/gecko/background/common/TestAndroidLogWriters.java]
 [src/org/mozilla/gecko/background/common/TestBrowserContractHelpers.java]
 [src/org/mozilla/gecko/background/common/TestUtils.java]
 [src/org/mozilla/gecko/background/common/TestWaitHelper.java]
 [src/org/mozilla/gecko/background/db/TestAndroidBrowserBookmarksRepository.java]
-[src/org/mozilla/gecko/background/db/TestAndroidBrowserHistoryDataExtender.java]
 [src/org/mozilla/gecko/background/db/TestAndroidBrowserHistoryRepository.java]
 [src/org/mozilla/gecko/background/db/TestBookmarks.java]
-[src/org/mozilla/gecko/background/db/TestCachedSQLiteOpenHelper.java]
 [src/org/mozilla/gecko/background/db/TestClientsDatabase.java]
 [src/org/mozilla/gecko/background/db/TestClientsDatabaseAccessor.java]
 [src/org/mozilla/gecko/background/db/TestFennecTabsRepositorySession.java]
 [src/org/mozilla/gecko/background/db/TestFormHistoryRepositorySession.java]
 [src/org/mozilla/gecko/background/db/TestPasswordsRepository.java]
 [src/org/mozilla/gecko/background/fxa/TestBrowserIDKeyPairGeneration.java]
 [src/org/mozilla/gecko/background/fxa/authenticator/TestAccountPickler.java]
 [src/org/mozilla/gecko/background/nativecode/test/TestNativeCrypto.java]

deleted file mode 100644
--- a/mobile/android/tests/background/junit3/src/org/mozilla/gecko/background/db/TestAndroidBrowserHistoryDataExtender.java
+++ /dev/null
@@ -1,145 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-package org.mozilla.gecko.background.db;
-
-import android.database.Cursor;
-
-import org.json.simple.JSONArray;
-import org.json.simple.JSONObject;
-import org.mozilla.gecko.background.helpers.AndroidSyncTestCase;
-import org.mozilla.gecko.background.sync.helpers.HistoryHelpers;
-import org.mozilla.gecko.sync.ExtendedJSONObject;
-import org.mozilla.gecko.sync.Utils;
-import org.mozilla.gecko.sync.repositories.NullCursorException;
-import org.mozilla.gecko.sync.repositories.android.AndroidBrowserHistoryDataExtender;
-import org.mozilla.gecko.sync.repositories.android.RepoUtils;
-import org.mozilla.gecko.sync.repositories.domain.HistoryRecord;
-
-import java.util.ArrayList;
-
-public class TestAndroidBrowserHistoryDataExtender extends AndroidSyncTestCase {
-
-  protected AndroidBrowserHistoryDataExtender extender;
-  protected static final String LOG_TAG = "SyncHistoryVisitsTest";
-
-  public void setUp() {
-    extender = new AndroidBrowserHistoryDataExtender(getApplicationContext());
-    extender.wipe();
-  }
-
-  public void tearDown() {
-    extender.close();
-  }
-
-  public void testStoreFetch() throws Exception {
-    String guid = Utils.generateGuid();
-    extender.store(Utils.generateGuid(), null);
-    extender.store(guid, null);
-    extender.store(Utils.generateGuid(), null);
-
-    Cursor cur = null;
-    try {
-      cur = extender.fetch(guid);
-      assertEquals(1, cur.getCount());
-      assertTrue(cur.moveToFirst());
-      assertEquals(guid, cur.getString(0));
-    } finally {
-      if (cur != null) {
-        cur.close();
-      }
-    }
-  }
-
-  public void testVisitsForGUID() throws Exception {
-    String guid = Utils.generateGuid();
-    JSONArray visits = new ExtendedJSONObject("{ \"visits\": [ { \"key\" : \"value\" } ] }").getArray("visits");
-
-    extender.store(Utils.generateGuid(), null);
-    extender.store(guid, visits);
-    extender.store(Utils.generateGuid(), null);
-
-    JSONArray fetchedVisits = extender.visitsForGUID(guid);
-    assertEquals(1, fetchedVisits.size());
-    assertEquals("value", ((JSONObject)fetchedVisits.get(0)).get("key"));
-  }
-
-  public void testDeleteHandlesBadGUIDs() {
-    String evilGUID = "' or '1'='1";
-    extender.store(Utils.generateGuid(), null);
-    extender.store(Utils.generateGuid(), null);
-    extender.store(evilGUID, null);
-    extender.delete(evilGUID);
-
-    Cursor cur = null;
-    try {
-      cur = extender.fetchAll();
-      assertEquals(cur.getCount(), 2);
-      assertTrue(cur.moveToFirst());
-      while (!cur.isAfterLast()) {
-        String guid = RepoUtils.getStringFromCursor(cur, AndroidBrowserHistoryDataExtender.COL_GUID);
-        assertFalse(evilGUID.equals(guid));
-        cur.moveToNext();
-      }
-    } catch (NullCursorException e) {
-      e.printStackTrace();
-      fail("Should not have null cursor.");
-    } finally {
-      if (cur != null) {
-        cur.close();
-      }
-    }
-  }
-
-  public void testStoreFetchHandlesBadGUIDs() {
-    String evilGUID = "' or '1'='1";
-    extender.store(Utils.generateGuid(), null);
-    extender.store(Utils.generateGuid(), null);
-    extender.store(evilGUID, null);
-
-    Cursor cur = null;
-    try {
-      cur = extender.fetch(evilGUID);
-      assertEquals(1, cur.getCount());
-      assertTrue(cur.moveToFirst());
-      while (!cur.isAfterLast()) {
-        String guid = RepoUtils.getStringFromCursor(cur, AndroidBrowserHistoryDataExtender.COL_GUID);
-        assertEquals(evilGUID, guid);
-        cur.moveToNext();
-      }
-    } catch (NullCursorException e) {
-      e.printStackTrace();
-      fail("Should not have null cursor.");
-    } finally {
-      if (cur != null) {
-        cur.close();
-      }
-    }
-  }
-
-  public void testBulkInsert() throws NullCursorException {
-    ArrayList<HistoryRecord> records = new ArrayList<HistoryRecord>();
-    records.add(HistoryHelpers.createHistory1());
-    records.add(HistoryHelpers.createHistory2());
-    extender.bulkInsert(records);
-
-    for (HistoryRecord record : records) {
-      HistoryRecord toCompare = (HistoryRecord) record.copyWithIDs(record.guid, record.androidID);
-      toCompare.visits = extender.visitsForGUID(record.guid);
-      assertEquals(record.visits.size(), toCompare.visits.size());
-      assertTrue(record.equals(toCompare));
-    }
-
-    // Now insert existing records, changing one, and add another record.
-    records.get(0).title = "test";
-    records.add(HistoryHelpers.createHistory3());
-    extender.bulkInsert(records);
-
-    for (HistoryRecord record : records) {
-      HistoryRecord toCompare = (HistoryRecord) record.copyWithIDs(record.guid, record.androidID);
-      toCompare.visits = extender.visitsForGUID(record.guid);
-      assertEquals(record.visits.size(), toCompare.visits.size());
-      assertTrue(record.equals(toCompare));
-    }
-  }
-}

--- a/mobile/android/tests/background/junit3/src/org/mozilla/gecko/background/db/TestAndroidBrowserHistoryRepository.java
+++ b/mobile/android/tests/background/junit3/src/org/mozilla/gecko/background/db/TestAndroidBrowserHistoryRepository.java
@@ -2,30 +2,27 @@
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
 package org.mozilla.gecko.background.db;
 
 import java.util.ArrayList;
 
 import org.json.simple.JSONObject;
 import org.mozilla.gecko.background.sync.helpers.ExpectFetchDelegate;
-import org.mozilla.gecko.background.sync.helpers.ExpectFinishDelegate;
 import org.mozilla.gecko.background.sync.helpers.HistoryHelpers;
 import org.mozilla.gecko.db.BrowserContract;
 import org.mozilla.gecko.sync.Utils;
-import org.mozilla.gecko.sync.repositories.InactiveSessionException;
 import org.mozilla.gecko.sync.repositories.NullCursorException;
 import org.mozilla.gecko.sync.repositories.Repository;
 import org.mozilla.gecko.sync.repositories.RepositorySession;
 import org.mozilla.gecko.sync.repositories.android.AndroidBrowserHistoryDataAccessor;
 import org.mozilla.gecko.sync.repositories.android.AndroidBrowserHistoryRepository;
 import org.mozilla.gecko.sync.repositories.android.AndroidBrowserHistoryRepositorySession;
 import org.mozilla.gecko.sync.repositories.android.AndroidBrowserRepository;
 import org.mozilla.gecko.sync.repositories.android.AndroidBrowserRepositoryDataAccessor;
-import org.mozilla.gecko.sync.repositories.android.AndroidBrowserRepositorySession;
 import org.mozilla.gecko.sync.repositories.android.BrowserContractHelpers;
 import org.mozilla.gecko.sync.repositories.android.RepoUtils;
 import org.mozilla.gecko.sync.repositories.delegates.RepositorySessionCreationDelegate;
 import org.mozilla.gecko.sync.repositories.domain.HistoryRecord;
 import org.mozilla.gecko.sync.repositories.domain.Record;
 
 import android.content.ContentValues;
 import android.content.Context;
@@ -57,24 +54,16 @@ public class TestAndroidBrowserHistoryRe
   }
 
   @Override
   protected AndroidBrowserRepositoryDataAccessor getDataAccessor() {
     return new AndroidBrowserHistoryDataAccessor(getApplicationContext());
   }
 
   @Override
-  protected void closeDataAccessor(AndroidBrowserRepositoryDataAccessor dataAccessor) {
-    if (!(dataAccessor instanceof AndroidBrowserHistoryDataAccessor)) {
-      throw new IllegalArgumentException("Only expecting a history data accessor.");
-    }
-    ((AndroidBrowserHistoryDataAccessor) dataAccessor).closeExtender();
-  }
-
-  @Override
   public void testFetchAll() {
     Record[] expected = new Record[2];
     expected[0] = HistoryHelpers.createHistory3();
     expected[1] = HistoryHelpers.createHistory2();
     basicFetchAllTest(expected);
   }
 
   /*
@@ -453,46 +442,9 @@ public class TestAndroidBrowserHistoryRe
     records.add(HistoryHelpers.createHistory1());
     records.add(HistoryHelpers.createHistory2());
     records.add(HistoryHelpers.createHistory3());
     db.bulkInsert(records);
 
     performWait(fetchAllRunnable(session, preparedExpectFetchDelegate(records.toArray(new Record[records.size()]))));
     session.abort();
   }
-
-  public void testDataExtenderIsClosedBeforeBegin() {
-    // Create a session but don't begin() it.
-    final AndroidBrowserRepositorySession session = (AndroidBrowserRepositorySession) createSession();
-    AndroidBrowserHistoryDataAccessor db = (AndroidBrowserHistoryDataAccessor) session.getDBHelper();
-
-    // Confirm dataExtender is closed before beginning session.
-    assertTrue(db.getHistoryDataExtender().isClosed());
-  }
-
-  public void testDataExtenderIsClosedAfterFinish() throws InactiveSessionException {
-    final AndroidBrowserHistoryRepositorySession session = (AndroidBrowserHistoryRepositorySession) createAndBeginSession();
-    AndroidBrowserHistoryDataAccessor db = (AndroidBrowserHistoryDataAccessor) session.getDBHelper();
-
-    // Perform an action that opens the dataExtender.
-    HistoryRecord h1 = HistoryHelpers.createHistory1();
-    db.insert(h1);
-    assertFalse(db.getHistoryDataExtender().isClosed());
-
-    // Check dataExtender is closed upon finish.
-    performWait(finishRunnable(session, new ExpectFinishDelegate()));
-    assertTrue(db.getHistoryDataExtender().isClosed());
-  }
-
-  public void testDataExtenderIsClosedAfterAbort() throws InactiveSessionException {
-    final AndroidBrowserHistoryRepositorySession session = (AndroidBrowserHistoryRepositorySession) createAndBeginSession();
-    AndroidBrowserHistoryDataAccessor db = (AndroidBrowserHistoryDataAccessor) session.getDBHelper();
-
-    // Perform an action that opens the dataExtender.
-    HistoryRecord h1 = HistoryHelpers.createHistory1();
-    db.insert(h1);
-    assertFalse(db.getHistoryDataExtender().isClosed());
-
-    // Check dataExtender is closed upon abort.
-    session.abort();
-    assertTrue(db.getHistoryDataExtender().isClosed());
-  }
 }

deleted file mode 100644
--- a/mobile/android/tests/background/junit3/src/org/mozilla/gecko/background/db/TestCachedSQLiteOpenHelper.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-package org.mozilla.gecko.background.db;
-
-import org.mozilla.gecko.background.sync.helpers.HistoryHelpers;
-import org.mozilla.gecko.sync.repositories.NullCursorException;
-import org.mozilla.gecko.sync.repositories.android.AndroidBrowserHistoryDataExtender;
-import org.mozilla.gecko.sync.repositories.android.ClientsDatabase;
-import org.mozilla.gecko.sync.repositories.domain.ClientRecord;
-import org.mozilla.gecko.sync.repositories.domain.HistoryRecord;
-import org.mozilla.gecko.sync.setup.Constants;
-
-import android.database.Cursor;
-import android.test.AndroidTestCase;
-
-public class TestCachedSQLiteOpenHelper extends AndroidTestCase {
-
-  protected ClientsDatabase clientsDB;
-  protected AndroidBrowserHistoryDataExtender extender;
-
-  public void setUp() {
-    clientsDB = new ClientsDatabase(mContext);
-    extender = new AndroidBrowserHistoryDataExtender(mContext);
-  }
-
-  public void tearDown() {
-    clientsDB.close();
-    extender.close();
-  }
-
-  public void testUnclosedDatabasesDontInteract() throws NullCursorException {
-    // clientsDB gracefully does its thing and closes.
-    clientsDB.wipeClientsTable();
-    ClientRecord record = new ClientRecord();
-    String profileConst = Constants.DEFAULT_PROFILE;
-    clientsDB.store(profileConst, record);
-    clientsDB.close();
-
-    // extender does its thing but still hasn't closed.
-    HistoryRecord h = HistoryHelpers.createHistory1();
-    extender.store(h.guid, h.visits);
-
-    // Ensure items in the clientsDB are still accessible nonetheless.
-    Cursor cur = null;
-    try {
-      cur = clientsDB.fetchAllClients();
-      assertTrue(cur.moveToFirst());
-      assertEquals(1, cur.getCount());
-    } finally {
-      if (cur != null) {
-        cur.close();
-      }
-    }
-  }
-}