Bug 1628052 - Remove uses of dom.ipc.keepProcessesAlive.webIsolated.perOrigin to fix leaks. r=kmag

Differential Revision: https://phabricator.services.mozilla.com/D70076

browser/base/content/test/tabs/browser.ini

@@ -1,9 +1,4 @@
 [DEFAULT]
-prefs =
-    # With Fission enabled, this directory spawns many child processes, which
-    # somehow results in frequent shutdown leaks. Reuse the content processes
-    # to avoid this.
-    dom.ipc.keepProcessesAlive.webIsolated.perOrigin=1
 support-files =
   head.js
   dummy_page.html

browser/components/extensions/test/browser/browser.ini

@@ -5,8 +5,8 @@ prefs =
     # to spawn a new extension child process for each test unit.
     dom.ipc.keepProcessesAlive.extension=1
     # With Fission enabled, this directory spawns many child processes, which
-    # somehow results in frequent leaks and shutdown hangs. Reuse the content
-    # processes to avoid this.
+    # somehow results in frequent shutdown hangs. Reuse the content processes to
+    # avoid this.
     dom.ipc.keepProcessesAlive.webIsolated.perOrigin=1
     dom.animations-api.core.enabled=true
     dom.animations-api.timelines.enabled=true

browser/components/privatebrowsing/test/browser/browser_privatebrowsing_rememberprompt.js

@@ -5,14 +5,9 @@
 // This test makes sure that the geolocation prompt does not show a remember
 // control inside the private browsing mode.
 
-// This test leaks intermittently with Fission. Make it behave more like
-// non-Fission e10s tests to try to avoid them.
 add_task(async function setup() {
   await SpecialPowers.pushPrefEnv({
-    set: [
-      ["dom.ipc.keepProcessesAlive.webIsolated.perOrigin", 1],
-      ["dom.vr.always_support_vr", true],
-    ],
+    set: [["dom.vr.always_support_vr", true]],
   });
 });
 

browser/components/uitour/test/browser.ini

@@ -1,8 +1,8 @@
 [DEFAULT]
 prefs =
     # With Fission enabled, this directory spawns many child processes, which
-    # somehow results in frequent shutdown leaks and hangs. Reuse the content
-    # processes to avoid this.
+    # somehow results in frequent shutdown hangs. Reuse the content processes to
+    # avoid this.
     dom.ipc.keepProcessesAlive.webIsolated.perOrigin=1
 support-files =
   head.js

browser/components/urlbar/tests/browser/browser.ini

@@ -7,11 +7,6 @@ support-files =
   dummy_page.html
   head.js
   head-common.js
-prefs =
-    # With Fission enabled, these tests spawns many child processes, which
-    # somehow results in frequent shutdown leaks. Reuse the content processes
-    # to avoid this.
-    dom.ipc.keepProcessesAlive.webIsolated.perOrigin=1
 
 [browser_aboutHomeLoading.js]
 [browser_action_searchengine.js]

toolkit/components/reader/test/browser.ini

@@ -1,8 +1,8 @@
 [DEFAULT]
 prefs =
     # With Fission enabled, this directory spawns many child processes, which
-    # somehow results in frequent shutdown leaks. Reuse the content processes
-    # to avoid this. See bug 1594572.
+    # somehow results in frequent shutdown hangs. Reuse the content processes to
+    # avoid this. See bug 1594572.
     dom.ipc.keepProcessesAlive.webIsolated.perOrigin=1
 support-files = head.js
 [browser_readerMode.js]