Update {virtual,override} to follow C++11 style in device.

device/battery/battery_status_manager_win.cc

 // Copyright 2014 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 "device/battery/battery_status_manager_win.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string16.h"
@@ skipping 142 matching lines @@
   BatteryCallback callback_;
   scoped_ptr<base::win::MessageWindow> window_;
 
   DISALLOW_COPY_AND_ASSIGN(BatteryStatusObserver);
 };
 
 class BatteryStatusManagerWin : public BatteryStatusManager {
  public:
   explicit BatteryStatusManagerWin(const BatteryCallback& callback)
       : battery_observer_(new BatteryStatusObserver(callback)) {}
-  virtual ~BatteryStatusManagerWin() { battery_observer_->Stop(); }
+  ~BatteryStatusManagerWin() override { battery_observer_->Stop(); }
 
  public:
   // BatteryStatusManager:
-  virtual bool StartListeningBatteryChange() override {
+  bool StartListeningBatteryChange() override {
     battery_observer_->Start();
     return true;
   }
 
-  virtual void StopListeningBatteryChange() override {
-    battery_observer_->Stop();
-  }
+  void StopListeningBatteryChange() override { battery_observer_->Stop(); }
 
  private:
   scoped_ptr<BatteryStatusObserver> battery_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(BatteryStatusManagerWin);
 };
 
 }  // namespace
 
 BatteryStatus ComputeWebBatteryStatus(const SYSTEM_POWER_STATUS& win_status) {
@@ skipping 22 matching lines @@
 }
 
 // static
 scoped_ptr<BatteryStatusManager> BatteryStatusManager::Create(
     const BatteryStatusService::BatteryUpdateCallback& callback) {
   return scoped_ptr<BatteryStatusManager>(
       new BatteryStatusManagerWin(callback));
 }
 
 }  // namespace device