components: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

components/update_client/background_downloader_win.h

 // Copyright 2014 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 COMPONENTS_UPDATE_CLIENT_BACKGROUND_DOWNLOADER_WIN_H_
 #define COMPONENTS_UPDATE_CLIENT_BACKGROUND_DOWNLOADER_WIN_H_
 
 #include <windows.h>
 #include <bits.h>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "base/win/scoped_comptr.h"
 #include "components/update_client/crx_downloader.h"
 
 namespace base {
 class FilePath;
-class MessageLoopProxy;
 class SingleThreadTaskRunner;
 }
 
 namespace update_client {
 
 // Implements a downloader in terms of the BITS service. The public interface
 // of this class and the CrxDownloader overrides are expected to be called
 // from the main thread. The rest of the class code runs on a single thread
 // task runner. This task runner must be initialized to work with COM objects.
 // Instances of this class are created and destroyed in the main thread.
@@ skipping 77 matching lines @@
 
   // Contains the path of the downloaded file if the download was successful.
   base::FilePath response_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundDownloader);
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_BACKGROUND_DOWNLOADER_WIN_H_