Move IPC::MessageFilter and router to a separate file

ipc/ipc_channel_proxy_unittest.cc

 // Copyright 2014 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 "build/build_config.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/pickle.h"
 #include "base/threading/thread.h"
 #include "ipc/ipc_message.h"
+#include "ipc/ipc_message_filter.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_test_base.h"
 
 namespace {
 
 #if defined(IPC_MESSAGE_START)
 #undef IPC_MESSAGE_START
 #endif
 
 enum Command {
@@ skipping 53 matching lines @@
     }
 
     channel_->Send(new IPC::Message(message));
     return true;
   }
 
  private:
   IPC::Channel* channel_;
 };
 
-class MessageCountFilter : public IPC::ChannelProxy::MessageFilter {
+class MessageCountFilter : public IPC::MessageFilter {
  public:
   MessageCountFilter()
       : messages_received_(0),
         supported_message_class_(0),
         is_global_filter_(true),
         filter_removed_(false),
         message_filtering_enabled_(false) {}
 
   MessageCountFilter(uint32 supported_message_class)
       : messages_received_(0),
@@ skipping 166 matching lines @@
                        IPC::Channel::MODE_CLIENT,
                        &listener);
   CHECK(channel.Connect());
   listener.Init(&channel);
 
   base::MessageLoop::current()->Run();
   return 0;
 }
 
 }  // namespace