Remove use of MessageLoopProxy

mojo/edk/system/channel_manager.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 "mojo/edk/system/channel_manager.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "base/task_runner.h"
 #include "mojo/edk/system/channel.h"
 #include "mojo/edk/system/channel_endpoint.h"
 #include "mojo/edk/system/message_pipe_dispatcher.h"
 
 namespace mojo {
 namespace system {
 
 namespace {
 
@@ skipping 176 matching lines @@
   if (callback_thread_task_runner) {
     bool ok = callback_thread_task_runner->PostTask(FROM_HERE, callback);
     DCHECK(ok);
   } else {
     callback.Run();
   }
 }
 
 }  // namespace system
 }  // namespace mojo