[chrome/browser/extensions] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

chrome/browser/extensions/api/image_writer_private/image_writer_utility_client.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 CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILITY_CLIENT_H_
 #define CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILITY_CLIENT_H_
 
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "content/public/browser/utility_process_host.h"
 #include "content/public/browser/utility_process_host_client.h"
 
 // Writes a disk image to a device inside the utility process.
 class ImageWriterUtilityClient : public content::UtilityProcessHostClient {
  public:
   typedef base::Callback<void()> CancelCallback;
   typedef base::Callback<void()> SuccessCallback;
   typedef base::Callback<void(int64)> ProgressCallback;
@@ skipping 52 matching lines @@
   void OnWriteImageFailed(const std::string& message);
   void OnWriteImageProgress(int64 progress);
 
   CancelCallback cancel_callback_;
   ProgressCallback progress_callback_;
   SuccessCallback success_callback_;
   ErrorCallback error_callback_;
 
   base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
 
-  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
+  scoped_refptr<base::SingleThreadTaskRunner> thread_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageWriterUtilityClient);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILITY_CLIENT_H_