Decouple IPC::MessageFilter from IPC::Channel

content/renderer/media/audio_input_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_INPUT_MESSAGE_FILTER_H_
 #define CONTENT_RENDERER_MEDIA_AUDIO_INPUT_MESSAGE_FILTER_H_
 
 #include "base/id_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
@@ skipping 36 matching lines @@
   // stream_id and the destination render_view_id.
   class AudioInputIPCImpl;
 
   virtual ~AudioInputMessageFilter();
 
   // Sends an IPC message using |channel_|.
   void Send(IPC::Message* message);
 
   // 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 OnFilterAdded(IPC::Sender* sender) OVERRIDE;
   virtual void OnFilterRemoved() OVERRIDE;
   virtual void OnChannelClosing() OVERRIDE;
 
   // Received when browser process has created an audio input stream.
   void OnStreamCreated(int stream_id,
                        base::SharedMemoryHandle handle,
 #if defined(OS_WIN)
                        base::SyncSocket::Handle socket_handle,
 #else
                        base::FileDescriptor socket_descriptor,
 #endif
                        uint32 length,
                        uint32 total_segments);
 
   // Notification of volume property of an audio input stream.
   void OnStreamVolume(int stream_id, double volume);
 
   // Received when internal state of browser process' audio input stream has
   // changed.
   void OnStreamStateChanged(int stream_id,
                             media::AudioInputIPCDelegate::State state);
 
   // A map of stream ids to delegates.
   IDMap<media::AudioInputIPCDelegate> delegates_;
 
-  // IPC channel for Send(), must only be accesed on |io_message_loop_|.
-  IPC::Channel* channel_;
+  // IPC sender for Send(), must only be accesed on |io_message_loop_|.
+  IPC::Sender* sender_;
 
   // Message loop on which IPC calls are driven.
   const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
 
   // The singleton instance for this filter.
   static AudioInputMessageFilter* g_filter;
 
   DISALLOW_COPY_AND_ASSIGN(AudioInputMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_INPUT_MESSAGE_FILTER_H_