Move IPC::MessageFilter and router to a separate file

content/child/child_message_filter.h

 // Copyright 2013 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_CHILD_CROSS_MESSAGE_FILTER_H_
 #define CONTENT_CHILD_CROSS_MESSAGE_FILTER_H_
 
-#include "ipc/ipc_channel_proxy.h"
+#include "base/memory/ref_counted.h"
+#include "ipc/ipc_sender.h"
 
 namespace base {
 class TaskRunner;
 }
 
+namespace IPC {
+class MessageFilter;
+}
+
 namespace content {
 
 class ThreadSafeSender;
 
 // A base class for implementing IPC MessageFilter's that run on a different
 // thread or TaskRunner than the main thread.
 class ChildMessageFilter
     : public base::RefCountedThreadSafe<ChildMessageFilter>,
       public IPC::Sender {
  public:
@@ skipping 21 matching lines @@
   virtual ~ChildMessageFilter();
 
  private:
   class Internal;
   friend class ChildThread;
   friend class RenderThreadImpl;
   friend class WorkerThread;
 
   friend class base::RefCountedThreadSafe<ChildMessageFilter>;
 
-  IPC::ChannelProxy::MessageFilter* GetFilter();
+  IPC::MessageFilter* GetFilter();
 
-  // This implements IPC::ChannelProxy::MessageFilter to hide the actual
-  // filter methods from child classes.
+  // This implements IPC::MessageFilter to hide the actual filter methods from
+  // child classes.
   Internal* internal_;
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CROSS_MESSAGE_FILTER_H_