--- a/dom/ipc/tests/browser_remote_navigation_delay_telemetry.js
+++ b/dom/ipc/tests/browser_remote_navigation_delay_telemetry.js
@@ -8,17 +8,16 @@ add_task(async function test_memory_dist
     return;
   }
 
   let canRecordExtended = Services.telemetry.canRecordExtended;
   Services.telemetry.canRecordExtended = true;
   registerCleanupFunction(() => Services.telemetry.canRecordExtended = canRecordExtended);
 
   Services.telemetry.snapshotKeyedHistograms(Ci.nsITelemetry.DATASET_RELEASE_CHANNEL_OPTIN,
-                                             true /* subsession */,
                                              true /* clear */);
 
   // Open a remote page in a new tab to trigger the WebNavigation:LoadURI.
   let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, "http://example.com");
   ok(tab1.linkedBrowser.isRemoteBrowser, "|tab1| should have a remote browser.");
 
   // Open a new tab with about:robots, so it ends up in the parent process with a non-remote browser.
   let tab2 = await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:robots");
@@ -26,29 +25,27 @@ add_task(async function test_memory_dist
   // Navigate the tab, so it will change remotness and it triggers the SessionStore:restoreTabContent case.
   await BrowserTestUtils.loadURI(tab2.linkedBrowser, "http://example.com");
   ok(tab2.linkedBrowser.isRemoteBrowser, "|tab2| should have a remote browser by now.");
 
   // There is no good way to make sure that the parent received the histogram entries from the child processes.
   // Let's stick to the ugly, spinning the event loop until we have a good approach (Bug 1357509).
   await BrowserTestUtils.waitForCondition(() => {
     let s = Services.telemetry.snapshotKeyedHistograms(Ci.nsITelemetry.DATASET_RELEASE_CHANNEL_OPTIN,
-                                                       true,
                                                        false).content["FX_TAB_REMOTE_NAVIGATION_DELAY_MS"];
     return s && "WebNavigation:LoadURI" in s && "SessionStore:restoreTabContent" in s;
   });
 
-  let s = Services.telemetry.snapshotKeyedHistograms(1, true, false).content["FX_TAB_REMOTE_NAVIGATION_DELAY_MS"];
+  let s = Services.telemetry.snapshotKeyedHistograms(1, false).content["FX_TAB_REMOTE_NAVIGATION_DELAY_MS"];
   let restoreTabSnapshot = s["SessionStore:restoreTabContent"];
   ok(restoreTabSnapshot.sum > 0, "Zero delay for the restoreTabContent case is unlikely.");
   ok(restoreTabSnapshot.sum < 10000, "More than 10 seconds delay for the restoreTabContent case is unlikely.");
 
   let loadURISnapshot = s["WebNavigation:LoadURI"];
   ok(loadURISnapshot.sum > 0, "Zero delay for the LoadURI case is unlikely.");
   ok(loadURISnapshot.sum < 10000, "More than 10 seconds delay for the LoadURI case is unlikely.");
 
   Services.telemetry.snapshotKeyedHistograms(Ci.nsITelemetry.DATASET_RELEASE_CHANNEL_OPTIN,
-                                             true /* subsession */,
                                              true /* clear */);
 
   BrowserTestUtils.removeTab(tab2);
   BrowserTestUtils.removeTab(tab1);
 });