Split ExtensionTestObserver and move to //extensions.

chrome/browser/extensions/app_background_page_apitest.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 "base/location.h"
 #include "base/path_service.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "chrome/browser/background/background_contents_service.h"
 #include "chrome/browser/background/background_contents_service_factory.h"
 #include "chrome/browser/background/background_mode_manager.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/notification_service.h"
@@ skipping 609 matching lines @@
       extensions::ProcessManager::Get(browser()->profile());
   ImpulseCallbackCounter idle_impulse_counter(manager, extension()->id());
   EXPECT_TRUE(nacl_modules_loaded.WaitUntilSatisfied());
 
   manager->SetKeepaliveImpulseDecrementCallbackForTesting(
       idle_impulse_counter.SetGoalAndGetCallback(1));
   nacl_modules_loaded.Reply("be idle");
   idle_impulse_counter.Wait();
 #endif
 }