Use a direct include of the message_loop header in cc/, chrome_frame/, cloud_print/, components.

cc/test/cc_test_suite.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 "cc/test/cc_test_suite.h"
 
 #include <string>
 
 #include "base/command_line.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/threading/thread_id_name_manager.h"
 #include "cc/base/switches.h"
 #include "cc/test/paths.h"
 
 namespace cc {
 
 CCTestSuite::CCTestSuite(int argc, char** argv)
     : base::TestSuite(argc, argv) {}
 
 CCTestSuite::~CCTestSuite() {}
 
 void CCTestSuite::Initialize() {
   base::TestSuite::Initialize();
   RegisterPathProvider();
 
   message_loop_.reset(new base::MessageLoop);
 
   base::ThreadIdNameManager::GetInstance()->SetName(
       base::PlatformThread::CurrentId(),
       "Main");
 }
 
 void CCTestSuite::Shutdown() {
   message_loop_.reset();
 
   base::TestSuite::Shutdown();
 }
 
 }  // namespace cc