chromeos: Add power supply info reading capability

chrome/browser/chromeos/status/status_area_view_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_STATUS_STATUS_AREA_VIEW_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_STATUS_STATUS_AREA_VIEW_CHROMEOS_H_
 #pragma once
 
 #include "chrome/browser/chromeos/status/status_area_view.h"
 
@@ skipping 21 matching lines @@
     SHOW_NETWORK_OPTIONS,
     SHOW_SYSTEM_OPTIONS
   };
 
   explicit StatusAreaViewChromeos();
   virtual ~StatusAreaViewChromeos();
 
   void Init(StatusAreaButton::Delegate* delegate, ScreenMode screen_mode);
 
   // PowerLibrary::Observer:
-  virtual void PowerChanged(const PowerSupplyStatus& status) OVERRIDE;
   virtual void SystemResumed() OVERRIDE;
 
   // TimezoneSettings::Observer:
   virtual void TimezoneChanged(const icu::TimeZone& timezone) OVERRIDE;
 
   // Sets default use 24hour clock mode.
   void SetDefaultUse24HourClock(bool use_24hour_clock);
 
   // Convenience function to add buttons to a status area for ChromeOS.
   static void AddChromeosButtons(StatusAreaView* status_area,
                                  StatusAreaButton::Delegate* delegate,
                                  ScreenMode screen_mode);
 
  private:
   void UpdateClockText();
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaViewChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_STATUS_STATUS_AREA_VIEW_CHROMEOS_H_