chrome: Use base::MessageLoop. (Part 3)

chrome/browser/chromeos/xinput_hierarchy_changed_event_listener_aura.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h"
 
 namespace chromeos {
 
 void XInputHierarchyChangedEventListener::Init() {
-  MessageLoopForUI::current()->AddObserver(this);
+  base::MessageLoopForUI::current()->AddObserver(this);
 }
 
 void XInputHierarchyChangedEventListener::StopImpl() {
-  MessageLoopForUI::current()->RemoveObserver(this);
+  base::MessageLoopForUI::current()->RemoveObserver(this);
 }
 
 base::EventStatus XInputHierarchyChangedEventListener::WillProcessEvent(
     const base::NativeEvent& event) {
   // There may be multiple listeners for the XI_HierarchyChanged event. So
   // always return EVENT_CONTINUE to make sure all the listeners receive the
   // event.
   ProcessedXEvent(event);
   return base::EVENT_CONTINUE;
 }
 
 void XInputHierarchyChangedEventListener::DidProcessEvent(
     const base::NativeEvent& event) {
 }
 
 }  // namespace chromeos