Change Isolate Extensions to be off by default.

chrome/browser/extensions/process_management_browsertest.cc

 // Copyright (c) 2012 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 "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 343 matching lines @@
       "form.action = '" + cws_web_url.spec() + "';\n"
       "form.submit();\n"
       "setTimeout(\n"
       "    function() { window.domAutomationController.send(true); },\n"
       "    0);\n";
 
   // Trigger a renderer-initiated POST navigation (via the form) to a Chrome Web
   // Store gallery URL (which will commit into a chrome-extension://cws-app-id).
   bool ignored_script_result = false;
   content::TestNavigationObserver nav_observer(web_contents, 1);
+  content::RenderProcessHostWatcher crash_observer(
+      web_contents->GetMainFrame()->GetProcess(),
+      content::RenderProcessHostWatcher::WATCH_FOR_PROCESS_EXIT);
+
   EXPECT_TRUE(content::ExecuteScriptAndExtractBool(
       web_contents, navigation_starting_script, &ignored_script_result));
 
+  // When --isolate-extensions is enabled, the expectation is that the store
+  // will be properly put in its own process, otherwise the renderer process
+  // is going to be terminated.
+  if (!extensions::IsIsolateExtensionsEnabled()) {
+    crash_observer.Wait();
+    return;
+  }
+
   // Verify that the navigation succeeded.
   nav_observer.Wait();
   EXPECT_EQ(cws_web_url, web_contents->GetLastCommittedURL());
 
   // Verify that we really have the Chrome Web Store app loaded in the Web
   // Contents.
   content::RenderProcessHost* new_process_host =
       web_contents->GetMainFrame()->GetProcess();
   EXPECT_TRUE(extensions::ProcessMap::Get(profile())->Contains(
       extensions::kWebStoreAppId, new_process_host->GetID()));
 
   // Verify that Chrome Web Store is isolated in a separate renderer process.
-  if (extensions::IsIsolateExtensionsEnabled())
-    EXPECT_NE(old_process_host, new_process_host);
+  EXPECT_NE(old_process_host, new_process_host);
 }