Remove message_loop_helpers.h and update the includes to point to the new location.

chrome/browser/user_style_sheet_watcher.h

 // 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.
 
 #ifndef CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_
 #define CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_
 #pragma once
 
 #include "base/file_path.h"
 #include "base/files/file_path_watcher.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop_helpers.h"
+#include "base/sequenced_task_runner_helpers.h"
 #include "chrome/browser/profiles/refcounted_profile_keyed_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "googleurl/src/gurl.h"
 
 class Profile;
 class UserStyleSheetLoader;
 
 // Watches the user style sheet file and triggers reloads on the file thread
@@ skipping 32 matching lines @@
 
   // Watches for changes to the css file so we can reload the style sheet.
   scoped_ptr<base::files::FilePathWatcher> file_watcher_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(UserStyleSheetWatcher);
 };
 
 #endif  // CHROME_BROWSER_USER_STYLE_SHEET_WATCHER_H_