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

content/browser/download/download_manager_impl.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 CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_
 #pragma once
 
 #include <map>
 #include <set>
 
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop_helpers.h"
 #include "base/observer_list.h"
+#include "base/sequenced_task_runner_helpers.h"
 #include "base/synchronization/lock.h"
 #include "content/browser/download/download_item_factory.h"
 #include "content/browser/download/download_item_impl.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/download_manager.h"
 
 class DownloadFileManager;
 
 class CONTENT_EXPORT DownloadManagerImpl
     : public content::DownloadManager,
@@ skipping 221 matching lines @@
 
   // Allows an embedder to control behavior. Guaranteed to outlive this object.
   content::DownloadManagerDelegate* delegate_;
 
   net::NetLog* net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManagerImpl);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_IMPL_H_