Decouple IPC::MessageFilter from IPC::Channel

content/renderer/media/video_capture_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.
 //
 // MessageFilter that handles video capture messages and delegates them to
 // video captures. VideoCaptureMessageFilter is operated on IO thread of
 // render process. It intercepts video capture messages and process them on
 // IO thread since these messages are time critical.
 
 #ifndef CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_H_
@@ skipping 62 matching lines @@
   void AddDelegate(Delegate* delegate);
 
   // Remove a delegate from the map.
   void RemoveDelegate(Delegate* delegate);
 
   // Send a message asynchronously.
   virtual bool Send(IPC::Message* message);
 
   // IPC::MessageFilter override. Called on IO thread.
   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;
 
  protected:
   virtual ~VideoCaptureMessageFilter();
 
  private:
   typedef std::map<int32, Delegate*> Delegates;
 
   // Receive a newly created buffer from browser process.
@@ skipping 33 matching lines @@
       const media::VideoCaptureFormats& formats_in_use);
 
   // Finds the delegate associated with |device_id|, NULL if not found.
   Delegate* find_delegate(int device_id) const;
 
   // A map of device ids to delegates.
   Delegates delegates_;
   Delegates pending_delegates_;
   int32 last_device_id_;
 
-  IPC::Channel* channel_;
+  IPC::Sender* sender_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_H_