Move IPC::MessageFilter and router to a separate file

ppapi/proxy/dispatcher.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 PPAPI_PROXY_DISPATCHER_H_
 #define PPAPI_PROXY_DISPATCHER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/tracked_objects.h"
-#include "ipc/ipc_channel_proxy.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/ppp.h"
 #include "ppapi/proxy/proxy_channel.h"
 #include "ppapi/proxy/interface_list.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/shared_impl/api_id.h"
 
+namespace IPC {
+class MessageFilter;
+}
+
 namespace ppapi {
 namespace proxy {
 
 class VarSerializationRules;
 
 // An interface proxy can represent either end of a cross-process interface
 // call. The "source" side is where the call is invoked, and the "target" side
 // is where the call ends up being executed.
 //
 // Plugin side                          | Browser side
@@ skipping 17 matching lines @@
   VarSerializationRules* serialization_rules() const {
     return serialization_rules_.get();
   }
 
   // Returns a non-owning pointer to the interface proxy for the given ID, or
   // NULL if the ID isn't found. This will create the proxy if it hasn't been
   // created so far.
   InterfaceProxy* GetInterfaceProxy(ApiID id);
 
   // Adds the given filter to the IO thread. Takes ownership of the pointer.
-  void AddIOThreadMessageFilter(IPC::ChannelProxy::MessageFilter* filter);
+  void AddIOThreadMessageFilter(IPC::MessageFilter* filter);
 
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 
   PP_GetInterface_Func local_get_interface() const {
     return local_get_interface_;
   }
 
   const PpapiPermissions& permissions() const { return permissions_; }
 
@@ skipping 21 matching lines @@
 
   PpapiPermissions permissions_;
 
   DISALLOW_COPY_AND_ASSIGN(Dispatcher);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_DISPATCHER_H_