Move IPC::MessageFilter and router to a separate file

components/nacl/renderer/pnacl_translation_resource_host.h

Index: components/nacl/renderer/pnacl_translation_resource_host.h
diff --git a/components/nacl/renderer/pnacl_translation_resource_host.h b/components/nacl/renderer/pnacl_translation_resource_host.h
index 6570cd048ed5bdc06b04494d7e6d40d7c3bf1355..7b413626d33a6721a21adcd9678c80756560be7f 100644
--- a/components/nacl/renderer/pnacl_translation_resource_host.h
+++ b/components/nacl/renderer/pnacl_translation_resource_host.h
@@ -7,8 +7,8 @@
 
 #include <map>
 
-#include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_platform_file.h"
+#include "ipc/message_filter.h"
 #include "ppapi/c/private/pp_file_handle.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 
@@ -22,7 +22,7 @@ struct PnaclCacheInfo;
 
 // "Resource" might not be the best name for the various things that pnacl
 // needs from the browser since "Resource" is a Pepper thing...
-class PnaclTranslationResourceHost : public IPC::ChannelProxy::MessageFilter {
+class PnaclTranslationResourceHost : public IPC::MessageFilter {
  public:
   explicit PnaclTranslationResourceHost(
       const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
@@ -54,7 +54,7 @@ class PnaclTranslationResourceHost : public IPC::ChannelProxy::MessageFilter {
   // Maps the instance with an outstanding cache request to the info
   // about that request.
   typedef std::map<PP_Instance, CacheRequestInfo> CacheRequestInfoMap;
-  // IPC::ChannelProxy::MessageFilter implementation.
+  // IPC::MessageFilter implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
   virtual void OnFilterRemoved() OVERRIDE;