Move audio messages to their own file.

content/renderer/audio_device.h

 // Copyright (c) 2010 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_AUDIO_DEVICE_H_
 #define CONTENT_RENDERER_AUDIO_DEVICE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 24 matching lines @@
               RenderCallback* callback);
   virtual ~AudioDevice();
 
   // Returns |true| on success.
   bool Start();
   bool Stop();
 
  private:
   // AudioMessageFilter::Delegate implementation.
   virtual void OnRequestPacket(AudioBuffersState buffers_state);
-  virtual void OnStateChanged(const ViewMsg_AudioStreamState_Params& state);
+  virtual void OnStateChanged(AudioStreamState state);
   virtual void OnCreated(base::SharedMemoryHandle handle, uint32 length);
   virtual void OnLowLatencyCreated(base::SharedMemoryHandle handle,
                                    base::SyncSocket::Handle socket_handle,
                                    uint32 length);
   virtual void OnVolume(double volume);
   virtual void OnDestroy();
 
   // DelegateSimpleThread::Delegate implementation.
   virtual void Run();
 
@@ skipping 19 matching lines @@
 
   static scoped_refptr<AudioMessageFilter> filter_;
   int32 stream_id_;
   scoped_ptr<base::SharedMemory> shared_memory_;
   scoped_ptr<base::SyncSocket> socket_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDevice);
 };
 
 #endif  // CONTENT_RENDERER_AUDIO_DEVICE_H_