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

content/renderer/p2p/socket_dispatcher.h

Index: content/renderer/p2p/socket_dispatcher.h
===================================================================
--- content/renderer/p2p/socket_dispatcher.h	(revision 278168)
+++ content/renderer/p2p/socket_dispatcher.h	(working copy)
@@ -74,7 +74,7 @@
 
   // IPC::MessageFilter override. Called on IO thread.
   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;
 
@@ -113,7 +113,7 @@
   scoped_refptr<ObserverListThreadSafe<NetworkListObserver> >
       network_list_observers_;
 
-  IPC::Sender* sender_;
+  IPC::Channel* channel_;
 
   DISALLOW_COPY_AND_ASSIGN(P2PSocketDispatcher);
 };