Fix virtual/override/final usage in the rest of Source/core/.

Source/core/events/UIEvent.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 33 matching lines @@
         return adoptRefWillBeNoop(new UIEvent);
     }
     static PassRefPtrWillBeRawPtr<UIEvent> create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView> view, int detail)
     {
         return adoptRefWillBeNoop(new UIEvent(type, canBubble, cancelable, view, detail));
     }
     static PassRefPtrWillBeRawPtr<UIEvent> create(const AtomicString& type, const UIEventInit& initializer)
     {
         return adoptRefWillBeNoop(new UIEvent(type, initializer));
     }
-    virtual ~UIEvent();
+    ~UIEvent() override;
 
     void initUIEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>, int detail);
 
     AbstractView* view() const { return m_view.get(); }
     int detail() const { return m_detail; }
     InputDevice* sourceDevice() const { return m_sourceDevice.get(); }
 
-    virtual const AtomicString& interfaceName() const override;
-    virtual bool isUIEvent() const override final;
+    const AtomicString& interfaceName() const override;
+    bool isUIEvent() const final;
 
     virtual int keyCode() const;
     virtual int charCode() const;
 
     virtual int which() const;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     UIEvent();
     UIEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>, int detail, InputDevice* sourceDevice = nullptr);
     UIEvent(const AtomicString&, const UIEventInit&);
 
 private:
     RefPtrWillBeMember<AbstractView> m_view;
     int m_detail;
     PersistentWillBeMember<InputDevice> m_sourceDevice;
 };
 
 } // namespace blink
 
 #endif // UIEvent_h