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

chromeos/dbus/ibus/ibus_config_client_unittest.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 "chromeos/dbus/ibus/ibus_config_client.h"
 
 #include <vector>
 
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/values.h"
 #include "chromeos/dbus/ibus/ibus_constants.h"
 #include "dbus/message.h"
 #include "dbus/mock_bus.h"
 #include "dbus/mock_object_proxy.h"
 #include "dbus/object_path.h"
 #include "dbus/values_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 597 matching lines @@
                                           "",
                                           ":0.2");
 
   // Make sure it is possible to emit method calls.
   client_->SetBoolValue(kKey, kSection, value,
                        base::Bind(&MockErrorCallback::Run,
                                   base::Unretained(&error_callback)));
 }
 
 }  // namespace chromeos