Move IPC::MessageFilter and router to a separate file

content/common/font_cache_dispatcher_win.h

 // Copyright (c) 2012 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_COMMON_FONT_CACHE_DISPATCHER_WIN_H_
 #define CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_
 
 #include <windows.h>
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
-#include "ipc/ipc_channel_proxy.h"
+#include "ipc/ipc_sender.h"
+#include "ipc/message_filter.h"
+
+namespace IPC {
+class Channel;
+}
 
 namespace content {
 
 // Dispatches messages used for font caching on Windows. This is needed because
 // Windows can't load fonts into its kernel cache in sandboxed processes. So the
 // sandboxed process asks the browser process to do this for it.
-class FontCacheDispatcher : public IPC::ChannelProxy::MessageFilter,
-                            public IPC::Sender {
+class FontCacheDispatcher : public IPC::MessageFilter, public IPC::Sender {
  public:
   FontCacheDispatcher();
   virtual ~FontCacheDispatcher();
 
   // IPC::Sender implementation:
   virtual bool Send(IPC::Message* message) OVERRIDE;
 
  private:
-  // IPC::ChannelProxy::MessageFilter implementation:
+  // IPC::MessageFilter implementation:
   virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnChannelClosing() OVERRIDE;
 
   // Message handlers.
   void OnPreCacheFont(const LOGFONT& font);
   void OnReleaseCachedFonts();
 
   IPC::Channel* channel_;
 
   DISALLOW_COPY_AND_ASSIGN(FontCacheDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_FONT_CACHE_DISPATCHER_WIN_H_