content/child: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/renderer/pepper/pepper_platform_audio_output.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_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/audio/audio_output_ipc.h"
 
 namespace media {
 class AudioParameters;
 }
 
 namespace base {
 class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace content {
 class AudioHelper;
 
 class PepperPlatformAudioOutput
     : public media::AudioOutputIPCDelegate,
       public base::RefCountedThreadSafe<PepperPlatformAudioOutput> {
  public:
   // Factory function, returns NULL on failure. StreamCreated() will be called
@@ skipping 45 matching lines @@
 
   // The client to notify when the stream is created. THIS MUST ONLY BE
   // ACCESSED ON THE MAIN THREAD.
   AudioHelper* client_;
 
   // Used to send/receive IPC. THIS MUST ONLY BE ACCESSED ON THE
   // I/O thread except to send messages and get the message loop.
   scoped_ptr<media::AudioOutputIPC> ipc_;
 
   scoped_refptr<base::MessageLoopProxy> main_message_loop_proxy_;
-  scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPlatformAudioOutput);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_H_