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

Source/modules/gamepad/GamepadEvent.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 GamepadEvent_h
 #define GamepadEvent_h
 
 #include "modules/EventModules.h"
 #include "modules/gamepad/Gamepad.h"
 #include "modules/gamepad/GamepadEventInit.h"
 
 namespace blink {
 
 class GamepadEvent final : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<GamepadEvent> create()
     {
         return adoptRefWillBeNoop(new GamepadEvent);
     }
     static PassRefPtrWillBeRawPtr<GamepadEvent> create(const AtomicString& type, bool canBubble, bool cancelable, Gamepad* gamepad)
     {
         return adoptRefWillBeNoop(new GamepadEvent(type, canBubble, cancelable, gamepad));
     }
     static PassRefPtrWillBeRawPtr<GamepadEvent> create(const AtomicString& type, const GamepadEventInit& initializer)
     {
         return adoptRefWillBeNoop(new GamepadEvent(type, initializer));
     }
-    virtual ~GamepadEvent();
+    ~GamepadEvent() override;
 
     Gamepad* gamepad() const { return m_gamepad.get(); }
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     GamepadEvent();
     GamepadEvent(const AtomicString& type, bool canBubble, bool cancelable, Gamepad*);
     GamepadEvent(const AtomicString&, const GamepadEventInit&);
 
     PersistentWillBeMember<Gamepad> m_gamepad;
 };
 
 } // namespace blink
 
 #endif // GamepadEvent_h