Decouple IPC::MessageFilter from IPC::Channel

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"
@@ skipping 47 matching lines @@
   virtual ~AudioMessageFilter();
 
  private:
   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_|.
+  // Sends an IPC message using |sender_|.
   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 output 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);
 
   // Received when internal state of browser process' audio output device has
   // changed.
   void OnStreamStateChanged(int stream_id,
                             media::AudioOutputIPCDelegate::State state);
 
   // Received when the browser process detects an output device change.
   void OnOutputDeviceChanged(int stream_id, int new_buffer_size,
                              int new_sample_rate);
 
-  // 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_;
 
   // A map of stream ids to delegates; must only be accessed on
   // |io_message_loop_|.
   IDMap<media::AudioOutputIPCDelegate> delegates_;
 
   // Audio hardware configuration to update when OnOutputDeviceChanged() fires.
   // Access is guarded by |lock_|.
   base::Lock lock_;
   media::AudioHardwareConfig* audio_hardware_config_;
 
   // Message loop on which IPC calls are driven.
   const scoped_refptr<base::MessageLoopProxy> io_message_loop_;
 
   // 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_