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

Source/modules/device_orientation/DeviceMotionDispatcher.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
 namespace blink {
 
 class DeviceMotionData;
 class WebDeviceMotionData;
 
 // This class listens to device motion data and notifies all registered controllers.
 class DeviceMotionDispatcher final : public GarbageCollectedFinalized<DeviceMotionDispatcher>, public PlatformEventDispatcher, public WebDeviceMotionListener {
     USING_GARBAGE_COLLECTED_MIXIN(DeviceMotionDispatcher);
 public:
     static DeviceMotionDispatcher& instance();
-    virtual ~DeviceMotionDispatcher();
+    ~DeviceMotionDispatcher() override;
 
     // Note that the returned object is owned by this class.
     // FIXME: make the return value const, see crbug.com/233174.
     DeviceMotionData* latestDeviceMotionData();
 
     // Inherited from WebDeviceMotionListener.
-    virtual void didChangeDeviceMotion(const WebDeviceMotionData&) override;
+    void didChangeDeviceMotion(const WebDeviceMotionData&) override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     DeviceMotionDispatcher();
 
     // Inherited from PlatformEventDispatcher.
-    virtual void startListening() override;
-    virtual void stopListening() override;
+    void startListening() override;
+    void stopListening() override;
 
     Member<DeviceMotionData> m_lastDeviceMotionData;
 };
 
 } // namespace blink
 
 #endif // DeviceMotionDispatcher_h