Add missing IWYU message_loop.h includes.

remoting/host/native_messaging/native_messaging_reader.cc

 // Copyright 2013 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 "remoting/host/native_messaging/native_messaging_reader.h"
 
 #include <cstdint>
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/json/json_reader.h"
 #include "base/location.h"
 #include "base/macros.h"
+#include "base/message_loop/message_loop.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 168 matching lines @@
 void NativeMessagingReader::InvokeMessageCallback(
     std::unique_ptr<base::Value> message) {
   message_callback_.Run(std::move(message));
 }
 
 void NativeMessagingReader::InvokeEofCallback() {
   eof_callback_.Run();
 }
 
 }  // namespace remoting