Update rendering classes to use OVERRIDE / FINAL when needed

Source/core/rendering/RenderScrollbarTheme.h

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #ifndef RenderScrollbarTheme_h
 #define RenderScrollbarTheme_h
 
 #include "platform/scroll/ScrollbarTheme.h"
 
 namespace WebCore {
 
 class PlatformMouseEvent;
 class Scrollbar;
 
-class RenderScrollbarTheme : public ScrollbarTheme {
+class RenderScrollbarTheme FINAL : public ScrollbarTheme {
 public:
     virtual ~RenderScrollbarTheme() { }
 
     virtual int scrollbarThickness(ScrollbarControlSize controlSize) OVERRIDE { return ScrollbarTheme::theme()->scrollbarThickness(controlSize); }
 
     virtual ScrollbarButtonsPlacement buttonsPlacement() const OVERRIDE { return ScrollbarTheme::theme()->buttonsPlacement(); }
 
     virtual bool supportsControlTints() const OVERRIDE { return true; }
 
     virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect) OVERRIDE;
@@ skipping 26 matching lines @@
     virtual void paintButton(GraphicsContext*, ScrollbarThemeClient*, const IntRect&, ScrollbarPart) OVERRIDE;
     virtual void paintThumb(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) OVERRIDE;
     virtual void paintTickmarks(GraphicsContext*, ScrollbarThemeClient*, const IntRect&) OVERRIDE;
 
     virtual IntRect constrainTrackRectToTrackPieces(ScrollbarThemeClient*, const IntRect&) OVERRIDE;
 };
 
 } // namespace WebCore
 
 #endif // RenderScrollbarTheme_h