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

remoting/host/config_file_watcher_unittest.cc

 // Copyright (c) 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/config_file_watcher.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "remoting/base/auto_thread.h"
 #include "remoting/base/auto_thread_task_runner.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gmock_mutant.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::_;
 using testing::AnyNumber;
 using testing::Return;
@@ skipping 108 matching lines @@
 
   // Modify the watched file.
   std::string data("test");
   EXPECT_NE(file_util::WriteFile(config_file_, data.c_str(),
                                  static_cast<int>(data.size())), -1);
 
   run_loop_.Run();
 }
 
 }  // namespace remoting