Update defaults for InstantExtended.

chrome/browser/extensions/extension_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 "chrome/browser/extensions/extension_browsertest.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 109 matching lines @@
   // ExtensionService and then the real profile with one, as we do when
   // running on chromeos.
   command_line->AppendSwitchASCII(chromeos::switches::kLoginUser,
                                   "TestUser@gmail.com");
   command_line->AppendSwitchASCII(chromeos::switches::kLoginProfile, "user");
 #endif
 }
 
 void ExtensionBrowserTest::SetUpOnMainThread() {
   InProcessBrowserTest::SetUpOnMainThread();
+  // Wait for the InstantNTP prerendered contents to load.
+  content::WindowedNotificationObserver observer(
+      content::NOTIFICATION_LOAD_STOP,
+      content::NotificationService::AllSources());
+  observer.Wait();
 }
 
 const Extension* ExtensionBrowserTest::LoadExtensionWithFlags(
     const base::FilePath& path, int flags) {
   ExtensionService* service = extensions::ExtensionSystem::Get(
       profile())->extension_service();
   {
     content::WindowedNotificationObserver observer(
         chrome::NOTIFICATION_EXTENSION_LOADED,
         content::NotificationService::AllSources());
@@ skipping 612 matching lines @@
     case chrome::NOTIFICATION_EXTENSION_LOAD_ERROR:
       VLOG(1) << "Got EXTENSION_LOAD_ERROR notification.";
       ++extension_load_errors_observed_;
       break;
 
     default:
       NOTREACHED();
       break;
   }
 }