Move IPC::MessageFilter and router to a separate file

ipc/ipc_sync_message_filter.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 "ipc/ipc_sync_message_filter.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/synchronization/waitable_event.h"
+#include "ipc/ipc_channel.h"
 #include "ipc/ipc_sync_message.h"
 
 using base::MessageLoopProxy;
 
 namespace IPC {
 
 SyncMessageFilter::SyncMessageFilter(base::WaitableEvent* shutdown_event)
     : channel_(NULL),
       listener_loop_(MessageLoopProxy::current()),
       shutdown_event_(shutdown_event) {
@@ skipping 97 matching lines @@
 
 void SyncMessageFilter::SignalAllEvents() {
   base::AutoLock auto_lock(lock_);
   for (PendingSyncMessages::iterator iter = pending_sync_messages_.begin();
        iter != pending_sync_messages_.end(); ++iter) {
     (*iter)->done_event->Signal();
   }
 }
 
 }  // namespace IPC