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

chrome/renderer/media/cast_ipc_dispatcher.cc

Index: chrome/renderer/media/cast_ipc_dispatcher.cc
===================================================================
--- chrome/renderer/media/cast_ipc_dispatcher.cc	(revision 278168)
+++ chrome/renderer/media/cast_ipc_dispatcher.cc	(working copy)
@@ -12,7 +12,7 @@
 
 CastIPCDispatcher::CastIPCDispatcher(
     const scoped_refptr<base::MessageLoopProxy>& io_message_loop)
-    : sender_(NULL),
+    : channel_(NULL),
       io_message_loop_(io_message_loop) {
   DCHECK(io_message_loop_);
   DCHECK(!global_instance_);
@@ -29,8 +29,8 @@
 
 void CastIPCDispatcher::Send(IPC::Message* message) {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
-  if (sender_) {
-    sender_->Send(message);
+  if (channel_) {
+    channel_->Send(message);
   } else {
     delete message;
   }
@@ -56,18 +56,18 @@
   return handled;
 }
 
-void CastIPCDispatcher::OnFilterAdded(IPC::Sender* sender) {
+void CastIPCDispatcher::OnFilterAdded(IPC::Channel* channel) {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
   DCHECK(!global_instance_);
   global_instance_ = this;
-  sender_ = sender;
+  channel_ = channel;
 }
 
 void CastIPCDispatcher::OnFilterRemoved() {
   DCHECK(io_message_loop_->BelongsToCurrentThread());
   DCHECK_EQ(this, global_instance_);
   global_instance_ = NULL;
-  sender_ = NULL;
+  channel_ = NULL;
 }
 
 void CastIPCDispatcher::OnChannelClosing() {