Decouple IPC::MessageFilter from IPC::Channel

chrome/renderer/media/cast_ipc_dispatcher.h

Index: chrome/renderer/media/cast_ipc_dispatcher.h
diff --git a/chrome/renderer/media/cast_ipc_dispatcher.h b/chrome/renderer/media/cast_ipc_dispatcher.h
index 320b79761367dde3b790f8a99f521446d177b050..82af5703285b647e57e1d75891d0aaed172e9909 100644
--- a/chrome/renderer/media/cast_ipc_dispatcher.h
+++ b/chrome/renderer/media/cast_ipc_dispatcher.h
@@ -29,7 +29,7 @@ class CastIPCDispatcher : public IPC::MessageFilter {
 
   // IPC::MessageFilter implementation
   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;
 
@@ -52,8 +52,8 @@ class CastIPCDispatcher : public IPC::MessageFilter {
 
   static CastIPCDispatcher* global_instance_;
 
-  // IPC channel for Send(); must only be accesed on |io_message_loop_|.
-  IPC::Channel* channel_;
+  // For IPC 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_;