Cleanup: Remove unneeded includes of notification_service.h in other headers....

chrome/test/thread_observer_helper.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_TEST_THREAD_OBSERVER_HELPER_H__
 #define CHROME_TEST_THREAD_OBSERVER_HELPER_H__
 #pragma once
 
 #include "base/ref_counted.h"
 #include "base/waitable_event.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/common/notification_observer_mock.h"
 #include "chrome/common/notification_registrar.h"
-#include "chrome/common/notification_service.h"
 
 // Helper class to add and remove observers on a non-UI thread from
 // the UI thread.
 template <class T, typename Traits>
 class ThreadObserverHelper : public base::RefCountedThreadSafe<T, Traits> {
  public:
   explicit ThreadObserverHelper(BrowserThread::ID id)
       : id_(id), done_event_(false, false) {}
 
   void Init() {
@@ skipping 37 matching lines @@
 typedef ThreadObserverHelper<
     DBThreadObserverHelper,
     BrowserThread::DeleteOnDBThread> DBThreadObserverHelperBase;
 
 class DBThreadObserverHelper : public DBThreadObserverHelperBase {
  public:
   DBThreadObserverHelper() : DBThreadObserverHelperBase(BrowserThread::DB) {}
 };
 
 #endif  // CHROME_TEST_THREAD_OBSERVER_HELPER_H__