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

Source/modules/battery/BatteryDispatcher.h

Index: Source/modules/battery/BatteryDispatcher.h
diff --git a/Source/modules/battery/BatteryDispatcher.h b/Source/modules/battery/BatteryDispatcher.h
index 8b1f72c872a08b3a2b656ba4f62896e2d703c590..40c3fcfb2ebf307d45372439b08f9c12e018c191 100644
--- a/Source/modules/battery/BatteryDispatcher.h
+++ b/Source/modules/battery/BatteryDispatcher.h
@@ -18,12 +18,12 @@ class BatteryDispatcher final : public GarbageCollectedFinalized<BatteryDispatch
     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();
 
@@ -31,8 +31,8 @@ private:
     BatteryDispatcher();
 
     // Inherited from PlatformEventDispatcher.
-    virtual void startListening() override;
-    virtual void stopListening() override;
+    void startListening() override;
+    void stopListening() override;
 
     Member<BatteryStatus> m_batteryStatus;
 };