Use a direct include of the message_loop header in remoting/.

remoting/host/setup/native_messaging_host_main.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/setup/native_messaging_host.h"
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "remoting/host/logging.h"
 #include "remoting/host/pairing_registry_delegate.h"
 #include "remoting/protocol/pairing_registry.h"
 
 #if defined(OS_POSIX)
 #include <unistd.h>
 #endif
 
 using remoting::protocol::PairingRegistry;
@@ skipping 21 matching lines @@
       remoting::CreatePairingRegistry(message_loop.message_loop_proxy());
   remoting::NativeMessagingHost host(remoting::DaemonController::Create(),
                                      pairing_registry,
                                      read_file, write_file,
                                      message_loop.message_loop_proxy(),
                                      run_loop.QuitClosure());
   host.Start();
   run_loop.Run();
   return 0;
 }