deleted file mode 100644
--- a/media/gmp-clearkey/0.1/ClearKeyPersistence.cpp
+++ /dev/null
@@ -1,260 +0,0 @@
-/*
- * Copyright 2015, Mozilla Foundation and contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "ClearKeyPersistence.h"
-#include "ClearKeyUtils.h"
-#include "ClearKeyStorage.h"
-#include "ClearKeySessionManager.h"
-#include "RefCounted.h"
-
-#include <stdint.h>
-#include <string.h>
-#include <set>
-#include <vector>
-#include <sstream>
-#include <assert.h>
-
-using namespace std;
-
-// Whether we've loaded the persistent session ids from GMPStorage yet.
-enum PersistentKeyState {
-  UNINITIALIZED,
-  LOADING,
-  LOADED
-};
-static PersistentKeyState sPersistentKeyState = UNINITIALIZED;
-
-// Set of session Ids of the persistent sessions created or residing in
-// storage.
-static set<uint32_t> sPersistentSessionIds;
-
-static vector<GMPTask*> sTasksBlockedOnSessionIdLoad;
-
-static void
-ReadAllRecordsFromIterator(GMPRecordIterator* aRecordIterator,
-                           void* aUserArg,
-                           GMPErr aStatus)
-{
-  assert(sPersistentKeyState == LOADING);
-  if (GMP_SUCCEEDED(aStatus)) {
-    // Extract the record names which are valid uint32_t's; they're
-    // the persistent session ids.
-    const char* name = nullptr;
-    uint32_t len = 0;
-    while (GMP_SUCCEEDED(aRecordIterator->GetName(&name, &len))) {
-      if (ClearKeyUtils::IsValidSessionId(name, len)) {
-        assert(name[len] == 0);
-        sPersistentSessionIds.insert(atoi(name));
-      }
-      aRecordIterator->NextRecord();
-    }
-  }
-  sPersistentKeyState = LOADED;
-  aRecordIterator->Close();
-
-  for (size_t i = 0; i < sTasksBlockedOnSessionIdLoad.size(); i++) {
-    sTasksBlockedOnSessionIdLoad[i]->Run();
-    sTasksBlockedOnSessionIdLoad[i]->Destroy();
-  }
-  sTasksBlockedOnSessionIdLoad.clear();
-}
-
-/* static */ void
-ClearKeyPersistence::EnsureInitialized()
-{
-  if (sPersistentKeyState == UNINITIALIZED) {
-    sPersistentKeyState = LOADING;
-    if (GMP_FAILED(EnumRecordNames(&ReadAllRecordsFromIterator))) {
-      sPersistentKeyState = LOADED;
-    }
-  }
-}
-
-/* static */ string
-ClearKeyPersistence::GetNewSessionId(GMPSessionType aSessionType)
-{
-  static uint32_t sNextSessionId = 1;
-
-  // Ensure we don't re-use a session id that was persisted.
-  while (Contains(sPersistentSessionIds, sNextSessionId)) {
-    sNextSessionId++;
-  }
-
-  string sessionId;
-  stringstream ss;
-  ss << sNextSessionId;
-  ss >> sessionId;
-
-  if (aSessionType == kGMPPersistentSession) {
-    sPersistentSessionIds.insert(sNextSessionId);
-  }
-
-  sNextSessionId++;
-
-  return sessionId;
-}
-
-
-class CreateSessionTask : public GMPTask {
-public:
-  CreateSessionTask(ClearKeySessionManager* aTarget,
-                    uint32_t aCreateSessionToken,
-                    uint32_t aPromiseId,
-                    const string& aInitDataType,
-                    const uint8_t* aInitData,
-                    uint32_t aInitDataSize,
-                    GMPSessionType aSessionType)
-    : mTarget(aTarget)
-    , mCreateSessionToken(aCreateSessionToken)
-    , mPromiseId(aPromiseId)
-    , mInitDataType(aInitDataType)
-    , mSessionType(aSessionType)
-  {
-    mInitData.insert(mInitData.end(),
-                     aInitData,
-                     aInitData + aInitDataSize);
-  }
-  virtual void Run() override {
-    mTarget->CreateSession(mCreateSessionToken,
-                           mPromiseId,
-                           mInitDataType.c_str(),
-                           mInitDataType.size(),
-                           &mInitData.front(),
-                           mInitData.size(),
-                           mSessionType);
-  }
-  virtual void Destroy() override {
-    delete this;
-  }
-private:
-  RefPtr<ClearKeySessionManager> mTarget;
-  uint32_t mCreateSessionToken;
-  uint32_t mPromiseId;
-  const string mInitDataType;
-  vector<uint8_t> mInitData;
-  GMPSessionType mSessionType;
-};
-
-
-/* static */ bool
-ClearKeyPersistence::DeferCreateSessionIfNotReady(ClearKeySessionManager* aInstance,
-                                                  uint32_t aCreateSessionToken,
-                                                  uint32_t aPromiseId,
-                                                  const string& aInitDataType,
-                                                  const uint8_t* aInitData,
-                                                  uint32_t aInitDataSize,
-                                                  GMPSessionType aSessionType)
-{
-  if (sPersistentKeyState >= LOADED)  {
-    return false;
-  }
-  GMPTask* t = new CreateSessionTask(aInstance,
-                                     aCreateSessionToken,
-                                     aPromiseId,
-                                     aInitDataType,
-                                     aInitData,
-                                     aInitDataSize,
-                                     aSessionType);
-  sTasksBlockedOnSessionIdLoad.push_back(t);
-  return true;
-}
-
-class LoadSessionTask : public GMPTask {
-public:
-  LoadSessionTask(ClearKeySessionManager* aTarget,
-                  uint32_t aPromiseId,
-                  const char* aSessionId,
-                  uint32_t aSessionIdLength)
-    : mTarget(aTarget)
-    , mPromiseId(aPromiseId)
-    , mSessionId(aSessionId, aSessionId + aSessionIdLength)
-  {
-  }
-  virtual void Run() override {
-    mTarget->LoadSession(mPromiseId,
-                         mSessionId.c_str(),
-                         mSessionId.size());
-  }
-  virtual void Destroy() override {
-    delete this;
-  }
-private:
-  RefPtr<ClearKeySessionManager> mTarget;
-  uint32_t mPromiseId;
-  string mSessionId;
-};
-
-/* static */ bool
-ClearKeyPersistence::DeferLoadSessionIfNotReady(ClearKeySessionManager* aInstance,
-                                                uint32_t aPromiseId,
-                                                const char* aSessionId,
-                                                uint32_t aSessionIdLength)
-{
-  if (sPersistentKeyState >= LOADED)  {
-    return false;
-  }
-  GMPTask* t = new LoadSessionTask(aInstance,
-                                   aPromiseId,
-                                   aSessionId,
-                                   aSessionIdLength);
-  sTasksBlockedOnSessionIdLoad.push_back(t);
-  return true;
-}
-
-/* static */ bool
-ClearKeyPersistence::IsPersistentSessionId(const string& aSessionId)
-{
-  return Contains(sPersistentSessionIds, atoi(aSessionId.c_str()));
-}
-
-class LoadSessionFromKeysTask : public ReadContinuation {
-public:
-  LoadSessionFromKeysTask(ClearKeySessionManager* aTarget,
-                          const string& aSessionId,
-                          uint32_t aPromiseId)
-    : mTarget(aTarget)
-    , mSessionId(aSessionId)
-    , mPromiseId(aPromiseId)
-  {
-  }
-
-  virtual void ReadComplete(GMPErr aStatus,
-                            const uint8_t* aData,
-                            uint32_t aLength) override
-  {
-    mTarget->PersistentSessionDataLoaded(aStatus, mPromiseId, mSessionId, aData, aLength);
-  }
-private:
-  RefPtr<ClearKeySessionManager> mTarget;
-  string mSessionId;
-  uint32_t mPromiseId;
-};
-
-/* static */ void
-ClearKeyPersistence::LoadSessionData(ClearKeySessionManager* aInstance,
-                                     const string& aSid,
-                                     uint32_t aPromiseId)
-{
-  LoadSessionFromKeysTask* loadTask =
-    new LoadSessionFromKeysTask(aInstance, aSid, aPromiseId);
-  ReadData(aSid, loadTask);
-}
-
-/* static */ void
-ClearKeyPersistence::PersistentSessionRemoved(const string& aSessionId)
-{
-  sPersistentSessionIds.erase(atoi(aSessionId.c_str()));
-}

deleted file mode 100644
--- a/media/gmp-clearkey/0.1/ClearKeyPersistence.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * Copyright 2015, Mozilla Foundation and contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef __ClearKeyPersistence_h__
-#define __ClearKeyPersistence_h__
-
-#include <string>
-#include "gmp-api/gmp-decryption.h"
-
-class ClearKeySessionManager;
-
-class ClearKeyPersistence {
-public:
-  static void EnsureInitialized();
-
-  static std::string GetNewSessionId(GMPSessionType aSessionType);
-
-  static bool DeferCreateSessionIfNotReady(ClearKeySessionManager* aInstance,
-                                           uint32_t aCreateSessionToken,
-                                           uint32_t aPromiseId,
-                                           const std::string& aInitDataType,
-                                           const uint8_t* aInitData,
-                                           uint32_t aInitDataSize,
-                                           GMPSessionType aSessionType);
-
-  static bool DeferLoadSessionIfNotReady(ClearKeySessionManager* aInstance,
-                                         uint32_t aPromiseId,
-                                         const char* aSessionId,
-                                         uint32_t aSessionIdLength);
-
-  static bool IsPersistentSessionId(const std::string& aSid);
-
-  static void LoadSessionData(ClearKeySessionManager* aInstance,
-                              const std::string& aSid,
-                              uint32_t aPromiseId);
-
-  static void PersistentSessionRemoved(const std::string& aSid);
-};
-
-#endif // __ClearKeyPersistence_h__

--- a/media/gmp-clearkey/0.1/ClearKeySessionManager.cpp
+++ b/media/gmp-clearkey/0.1/ClearKeySessionManager.cpp
@@ -17,17 +17,16 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "ClearKeyDecryptionManager.h"
 #include "ClearKeySessionManager.h"
 #include "ClearKeyUtils.h"
 #include "ClearKeyStorage.h"
-#include "ClearKeyPersistence.h"
 #include "gmp-task-utils.h"
 #include <assert.h>
 
 using namespace std;
 
 ClearKeySessionManager::ClearKeySessionManager()
   : mDecryptionManager(ClearKeyDecryptionManager::Get())
 {
@@ -47,17 +46,23 @@ ClearKeySessionManager::~ClearKeySession
 
 void
 ClearKeySessionManager::Init(GMPDecryptorCallback* aCallback,
                              bool aDistinctiveIdentifierAllowed,
                              bool aPersistentStateAllowed)
 {
   CK_LOGD("ClearKeySessionManager::Init");
   mCallback = aCallback;
-  ClearKeyPersistence::EnsureInitialized();
+}
+
+string
+ClearKeySessionManager::GetNewSessionId()
+{
+  static uint32_t sNextSessionId = 1;
+  return to_string(sNextSessionId++);
 }
 
 void
 ClearKeySessionManager::CreateSession(uint32_t aCreateSessionToken,
                                       uint32_t aPromiseId,
                                       const char* aInitDataType,
                                       uint32_t aInitDataTypeSize,
                                       const uint8_t* aInitData,
@@ -72,27 +77,17 @@ ClearKeySessionManager::CreateSession(ui
       initDataType != "keyids" &&
       initDataType != "webm") {
     string message = "'" + initDataType + "' is an initDataType unsupported by ClearKey";
     mCallback->RejectPromise(aPromiseId, kGMPNotSupportedError,
                              message.c_str(), message.size());
     return;
   }
 
-  if (ClearKeyPersistence::DeferCreateSessionIfNotReady(this,
-                                                        aCreateSessionToken,
-                                                        aPromiseId,
-                                                        initDataType,
-                                                        aInitData,
-                                                        aInitDataSize,
-                                                        aSessionType)) {
-    return;
-  }
-
-  string sessionId = ClearKeyPersistence::GetNewSessionId(aSessionType);
+  string sessionId = GetNewSessionId();
   assert(mSessions.find(sessionId) == mSessions.end());
 
   ClearKeySession* session = new ClearKeySession(sessionId, mCallback, aSessionType);
   session->Init(aCreateSessionToken, aPromiseId, initDataType, aInitData, aInitDataSize);
   mSessions[sessionId] = session;
 
   const vector<KeyId>& sessionKeys = session->GetKeyIds();
   vector<KeyId> neededKeys;
@@ -119,89 +114,18 @@ ClearKeySessionManager::CreateSession(ui
 }
 
 void
 ClearKeySessionManager::LoadSession(uint32_t aPromiseId,
                                     const char* aSessionId,
                                     uint32_t aSessionIdLength)
 {
   CK_LOGD("ClearKeySessionManager::LoadSession");
-
-  if (!ClearKeyUtils::IsValidSessionId(aSessionId, aSessionIdLength)) {
-    mCallback->ResolveLoadSessionPromise(aPromiseId, false);
-    return;
-  }
-
-  if (ClearKeyPersistence::DeferLoadSessionIfNotReady(this,
-                                                      aPromiseId,
-                                                      aSessionId,
-                                                      aSessionIdLength)) {
-    return;
-  }
-
-  string sid(aSessionId, aSessionId + aSessionIdLength);
-  if (!ClearKeyPersistence::IsPersistentSessionId(sid)) {
-    mCallback->ResolveLoadSessionPromise(aPromiseId, false);
-    return;
-  }
-
-  // Callsback PersistentSessionDataLoaded with results...
-  ClearKeyPersistence::LoadSessionData(this, sid, aPromiseId);
-}
-
-void
-ClearKeySessionManager::PersistentSessionDataLoaded(GMPErr aStatus,
-                                                    uint32_t aPromiseId,
-                                                    const string& aSessionId,
-                                                    const uint8_t* aKeyData,
-                                                    uint32_t aKeyDataSize)
-{
-  CK_LOGD("ClearKeySessionManager::PersistentSessionDataLoaded");
-  if (GMP_FAILED(aStatus) ||
-      Contains(mSessions, aSessionId) ||
-      (aKeyDataSize % (2 * CENC_KEY_LEN)) != 0) {
-    mCallback->ResolveLoadSessionPromise(aPromiseId, false);
-    return;
-  }
-
-  ClearKeySession* session = new ClearKeySession(aSessionId,
-                                                 mCallback,
-                                                 kGMPPersistentSession);
-  mSessions[aSessionId] = session;
-
-  uint32_t numKeys = aKeyDataSize / (2 * CENC_KEY_LEN);
-
-  vector<GMPMediaKeyInfo> key_infos;
-  vector<KeyIdPair> keyPairs;
-  for (uint32_t i = 0; i < numKeys; i ++) {
-    const uint8_t* base = aKeyData + 2 * CENC_KEY_LEN * i;
-
-    KeyIdPair keyPair;
-
-    keyPair.mKeyId = KeyId(base, base + CENC_KEY_LEN);
-    assert(keyPair.mKeyId.size() == CENC_KEY_LEN);
-
-    keyPair.mKey = Key(base + CENC_KEY_LEN, base + 2 * CENC_KEY_LEN);
-    assert(keyPair.mKey.size() == CENC_KEY_LEN);
-
-    session->AddKeyId(keyPair.mKeyId);
-
-    mDecryptionManager->ExpectKeyId(keyPair.mKeyId);
-    mDecryptionManager->InitKey(keyPair.mKeyId, keyPair.mKey);
-    mKeyIds.insert(keyPair.mKey);
-
-    keyPairs.push_back(keyPair);
-    key_infos.push_back(GMPMediaKeyInfo(&keyPairs[i].mKeyId[0],
-                                        keyPairs[i].mKeyId.size(),
-                                        kGMPUsable));
-  }
-  mCallback->BatchedKeyStatusChanged(&aSessionId[0], aSessionId.size(),
-                                     key_infos.data(), key_infos.size());
-
-  mCallback->ResolveLoadSessionPromise(aPromiseId, true);
+  const char message[] = "Persistent sessions not supported.";
+  mCallback->RejectPromise(aPromiseId, kGMPNotSupportedError, message, strlen(message));
 }
 
 void
 ClearKeySessionManager::UpdateSession(uint32_t aPromiseId,
                                       const char* aSessionId,
                                       uint32_t aSessionIdLength,
                                       const uint8_t* aResponse,
                                       uint32_t aResponseSize)
@@ -325,18 +249,16 @@ ClearKeySessionManager::RemoveSession(ui
   bool isPersistent = session->Type() == kGMPPersistentSession;
   ClearInMemorySessionData(session);
 
   if (!isPersistent) {
     mCallback->ResolvePromise(aPromiseId);
     return;
   }
 
-  ClearKeyPersistence::PersistentSessionRemoved(sid);
-
   // Overwrite the record storing the sessionId's key data with a zero
   // length record to delete it.
   vector<uint8_t> emptyKeydata;
   GMPTask* resolve = WrapTask(mCallback, &GMPDecryptorCallback::ResolvePromise, aPromiseId);
   static const char* message = "Could not remove session";
   GMPTask* reject = WrapTask(mCallback,
                              &GMPDecryptorCallback::RejectPromise,
                              aPromiseId,

--- a/media/gmp-clearkey/0.1/ClearKeySessionManager.h
+++ b/media/gmp-clearkey/0.1/ClearKeySessionManager.h
@@ -68,25 +68,21 @@ public:
                                     const uint8_t* aServerCert,
                                     uint32_t aServerCertSize) override;
 
   virtual void Decrypt(GMPBuffer* aBuffer,
                        GMPEncryptedBufferMetadata* aMetadata) override;
 
   virtual void DecryptingComplete() override;
 
-  void PersistentSessionDataLoaded(GMPErr aStatus,
-                                   uint32_t aPromiseId,
-                                   const std::string& aSessionId,
-                                   const uint8_t* aKeyData,
-                                   uint32_t aKeyDataSize);
-
 private:
   ~ClearKeySessionManager();
 
+  std::string GetNewSessionId();
+
   void DoDecrypt(GMPBuffer* aBuffer, GMPEncryptedBufferMetadata* aMetadata);
   void Shutdown();
 
   void ClearInMemorySessionData(ClearKeySession* aSession);
   void Serialize(const ClearKeySession* aSession, std::vector<uint8_t>& aOutKeyData);
 
   RefPtr<ClearKeyDecryptionManager> mDecryptionManager;
 

--- a/media/gmp-clearkey/0.1/moz.build
+++ b/media/gmp-clearkey/0.1/moz.build
@@ -9,17 +9,16 @@ SharedLibrary('clearkey')
 FINAL_TARGET = 'dist/bin/gmp-clearkey/0.1'
 
 FINAL_TARGET_PP_FILES += ['clearkey.info.in']
 
 UNIFIED_SOURCES += [
     'ClearKeyAsyncShutdown.cpp',
     'ClearKeyBase64.cpp',
     'ClearKeyDecryptionManager.cpp',
-    'ClearKeyPersistence.cpp',
     'ClearKeySession.cpp',
     'ClearKeySessionManager.cpp',
     'ClearKeyStorage.cpp',
     'ClearKeyUtils.cpp',
     'gmp-clearkey.cpp',
 ]
 
 SOURCES += [