Fix virtual/override/final usage in Source/core/html/.

Source/core/html/HTMLAreaElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2008, 2009, 2011 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 34 matching lines @@
     LayoutRect computeRect(LayoutObject*) const;
     Path computePath(LayoutObject*) const;
 
     // The parent map's image.
     HTMLImageElement* imageElement() const;
 
 private:
     explicit HTMLAreaElement(Document&);
     ~HTMLAreaElement();
 
-    virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
-    virtual bool isKeyboardFocusable() const override;
-    virtual bool isMouseFocusable() const override;
-    virtual bool layoutObjectIsFocusable() const override;
-    virtual void updateFocusAppearance(bool /*restorePreviousSelection*/) override;
-    virtual void setFocus(bool) override;
+    void parseAttribute(const QualifiedName&, const AtomicString&) override;
+    bool isKeyboardFocusable() const override;
+    bool isMouseFocusable() const override;
+    bool layoutObjectIsFocusable() const override;
+    void updateFocusAppearance(bool /*restorePreviousSelection*/) override;
+    void setFocus(bool) override;
 
     enum Shape { Default, Poly, Rect, Circle, Unknown };
     Path getRegion(const LayoutSize&) const;
     void invalidateCachedRegion();
 
     OwnPtr<Path> m_region;
     Vector<Length> m_coords;
     LayoutSize m_lastSize;
     Shape m_shape;
 };
 
 } // namespace blink
 
 #endif // HTMLAreaElement_h