Move IPC::MessageFilter and router to a separate file

content/renderer/media/audio_message_filter.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_MEDIA_AUDIO_MESSAGE_FILTER_H_
 #define CONTENT_RENDERER_MEDIA_AUDIO_MESSAGE_FILTER_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/id_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
-#include "ipc/ipc_channel_proxy.h"
+#include "ipc/message_filter.h"
 #include "media/audio/audio_output_ipc.h"
 #include "media/base/audio_hardware_config.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace content {
 
 // MessageFilter that handles audio messages and delegates them to audio
 // renderers. Created on render thread, AudioMessageFilter is operated on
 // IO thread (secondary thread of render process) it intercepts audio messages
 // and process them on IO thread since these messages are time critical.
-class CONTENT_EXPORT AudioMessageFilter
-    : public IPC::ChannelProxy::MessageFilter {
+class CONTENT_EXPORT AudioMessageFilter : public IPC::MessageFilter {
  public:
   explicit AudioMessageFilter(
       const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
 
   // Getter for the one AudioMessageFilter object.
   static AudioMessageFilter* Get();
 
   // Create an AudioOutputIPC to be owned by one delegate.  |render_view_id| and
   // |render_frame_id| are the render view and render frame containing the
   // entity producing the audio.
@@ skipping 21 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(AudioMessageFilterTest, Basic);
   FRIEND_TEST_ALL_PREFIXES(AudioMessageFilterTest, Delegates);
 
   // Implementation of media::AudioOutputIPC which augments IPC calls with
   // stream_id and the source render_view_id.
   class AudioOutputIPCImpl;
 
   // Sends an IPC message using |channel_|.
   void Send(IPC::Message* message);
 
-  // IPC::ChannelProxy::MessageFilter override. Called on |io_message_loop|.
+  // IPC::MessageFilter override. Called on |io_message_loop|.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
   virtual void OnFilterRemoved() OVERRIDE;
   virtual void OnChannelClosing() OVERRIDE;
 
   // Received when browser process has created an audio output stream.
   void OnStreamCreated(int stream_id, base::SharedMemoryHandle handle,
 #if defined(OS_WIN)
                        base::SyncSocket::Handle socket_handle,
 #else
@@ skipping 27 matching lines @@
 
   // The singleton instance for this filter.
   static AudioMessageFilter* g_filter;
 
   DISALLOW_COPY_AND_ASSIGN(AudioMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_MESSAGE_FILTER_H_