Continuation of CL 5685007, rename the singleton accessor method in more files.

chrome/browser/chromeos/brightness_bubble.cc

 // Copyright (c) 2010 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/brightness_bubble.h"
 
 #include "app/resource_bundle.h"
 #include "base/singleton.h"
 #include "grit/theme_resources.h"
 
 namespace chromeos {
 
 BrightnessBubble::BrightnessBubble()
     : SettingLevelBubble(
           ResourceBundle::GetSharedInstance().GetBitmapNamed(
               IDR_BRIGHTNESS_BUBBLE_ICON),
           ResourceBundle::GetSharedInstance().GetBitmapNamed(
               IDR_BRIGHTNESS_BUBBLE_ICON),
           ResourceBundle::GetSharedInstance().GetBitmapNamed(
               IDR_BRIGHTNESS_BUBBLE_ICON)) {
 }
 
 // static
-BrightnessBubble* BrightnessBubble::instance() {
+BrightnessBubble* BrightnessBubble::GetInstance() {
   return Singleton<BrightnessBubble>::get();
 }
 
 }  // namespace chromeos