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

Source/modules/device_orientation/DeviceOrientationDispatcher.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 DeviceOrientationData;
 class WebDeviceOrientationData;
 
 // This class listens to device orientation data and notifies all registered controllers.
 class DeviceOrientationDispatcher final : public GarbageCollectedFinalized<DeviceOrientationDispatcher>, public PlatformEventDispatcher, public WebDeviceOrientationListener {
     USING_GARBAGE_COLLECTED_MIXIN(DeviceOrientationDispatcher);
 public:
     static DeviceOrientationDispatcher& instance();
-    virtual ~DeviceOrientationDispatcher();
+    ~DeviceOrientationDispatcher() override;
 
     // Note that the returned object is owned by this class.
     // FIXME: make the return value const, see crbug.com/233174.
     DeviceOrientationData* latestDeviceOrientationData();
 
     // Inherited from WebDeviceOrientationListener.
-    virtual void didChangeDeviceOrientation(const WebDeviceOrientationData&) override;
+    void didChangeDeviceOrientation(const WebDeviceOrientationData&) override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     DeviceOrientationDispatcher();
 
     // Inherited from PlatformEventDispatcher.
-    virtual void startListening() override;
-    virtual void stopListening() override;
+    void startListening() override;
+    void stopListening() override;
 
     Member<DeviceOrientationData> m_lastDeviceOrientationData;
 };
 
 } // namespace blink
 
 #endif // DeviceOrientationDispatcher_h