Move IPC::MessageFilter and router to a separate file

content/common/font_cache_dispatcher_win.cc

 // 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.
 
 #include "content/common/font_cache_dispatcher_win.h"
 
 #include <map>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
 #include "content/common/child_process_messages.h"
+#include "ipc/ipc_channel.h"
 
 namespace content {
 namespace {
 typedef std::vector<base::string16> FontNameVector;
 typedef std::map<FontCacheDispatcher*, FontNameVector> DispatcherToFontNames;
 
 class FontCache {
  public:
   static FontCache* GetInstance() {
     return Singleton<FontCache>::get();
@@ skipping 162 matching lines @@
   FontCache::GetInstance()->PreCacheFont(font, this);
 }
 
 void FontCacheDispatcher::OnReleaseCachedFonts() {
   // Release cached fonts that requested from a pid by decrementing the ref
   // count.  When ref count is zero, the handles are released.
   FontCache::GetInstance()->ReleaseCachedFonts(this);
 }
 
 }  // namespace content