Change Isolate Extensions to be off by default.

chrome/browser/extensions/process_manager_browsertest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 713 matching lines @@
   EXPECT_TRUE(policy->CanRequestURL(
       main_frame->GetProcess()->GetID(),
       GURL("filesystem:chrome-extension://some-extension-id/some-path")));
   EXPECT_TRUE(policy->CanRequestURL(
       extension_frame->GetProcess()->GetID(),
       GURL("chrome-extension://some-extension-id/resource.html")));
   EXPECT_TRUE(policy->CanRequestURL(
       main_frame->GetProcess()->GetID(),
       GURL("chrome-extension://some-extension-id/resource.html")));
 
-  if (IsIsolateExtensionsEnabled()) {
+  if (extensions::IsIsolateExtensionsEnabled()) {
     EXPECT_TRUE(policy->CanCommitURL(
         extension_frame->GetProcess()->GetID(),
         GURL("blob:chrome-extension://some-extension-id/some-guid")));
     EXPECT_FALSE(policy->CanCommitURL(
         main_frame->GetProcess()->GetID(),
         GURL("blob:chrome-extension://some-extension-id/some-guid")));
     EXPECT_TRUE(policy->CanCommitURL(
         extension_frame->GetProcess()->GetID(),
         GURL("chrome-extension://some-extension-id/resource.html")));
     EXPECT_FALSE(policy->CanCommitURL(
@@ skipping 410 matching lines @@
   EXPECT_TRUE(ExecuteScriptAndExtractBool(
       popup, "window.domAutomationController.send(!!window.opener)",
       &is_opener_defined));
   EXPECT_TRUE(is_opener_defined);
 
   // Verify that postMessage to window.opener works.
   VerifyPostMessageToOpener(popup->GetMainFrame(), extension_frame);
 }
 
 }  // namespace extensions