Fix virtual/override/final usage in Source/modules/.

Source/modules/battery/BatteryDispatcher.h

 // 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.
 
 #ifndef BatteryDispatcher_h
 #define BatteryDispatcher_h
 
 #include "core/frame/PlatformEventDispatcher.h"
 #include "modules/battery/BatteryManager.h"
 #include "modules/battery/BatteryStatus.h"
 #include "public/platform/WebBatteryStatusListener.h"
 
 namespace blink {
 
 class WebBatteryStatus;
 
 class BatteryDispatcher final : public GarbageCollectedFinalized<BatteryDispatcher>, public PlatformEventDispatcher, public WebBatteryStatusListener {
     USING_GARBAGE_COLLECTED_MIXIN(BatteryDispatcher);
 public:
     static BatteryDispatcher& instance();
-    virtual ~BatteryDispatcher();
+    ~BatteryDispatcher() override;
 
     BatteryStatus* latestData();
 
     // Inherited from WebBatteryStatusListener.
-    virtual void updateBatteryStatus(const WebBatteryStatus&) override;
+    void updateBatteryStatus(const WebBatteryStatus&) override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     BatteryDispatcher();
 
     // Inherited from PlatformEventDispatcher.
-    virtual void startListening() override;
-    virtual void stopListening() override;
+    void startListening() override;
+    void stopListening() override;
 
     Member<BatteryStatus> m_batteryStatus;
 };
 
 } // namespace blink
 
 #endif // BatteryDispatcher_h