Revert 276939 "Decouple IPC::MessageFilter from IPC::Channel"

chrome/renderer/media/cast_ipc_dispatcher.h

Index: chrome/renderer/media/cast_ipc_dispatcher.h
===================================================================
--- chrome/renderer/media/cast_ipc_dispatcher.h	(revision 278168)
+++ chrome/renderer/media/cast_ipc_dispatcher.h	(working copy)
@@ -29,7 +29,7 @@
 
   // IPC::MessageFilter implementation
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-  virtual void OnFilterAdded(IPC::Sender* sender) OVERRIDE;
+  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
   virtual void OnFilterRemoved() OVERRIDE;
   virtual void OnChannelClosing() OVERRIDE;
 
@@ -52,8 +52,8 @@
 
   static CastIPCDispatcher* global_instance_;
 
-  // For IPC Send(); must only be accesed on |io_message_loop_|.
-  IPC::Sender* sender_;
+  // IPC channel for Send(); must only be accesed on |io_message_loop_|.
+  IPC::Channel* channel_;
 
   // Message loop on which IPC calls are driven.
   const scoped_refptr<base::MessageLoopProxy> io_message_loop_;