Update CSS classes to use OVERRIDE / FINAL when needed

Source/core/css/CSSCanvasValue.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 42 matching lines @@
     explicit CSSCanvasValue(const String& name)
         : CSSImageGeneratorValue(CanvasClass)
         , m_canvasObserver(this)
         , m_name(name)
         , m_element(0)
     {
     }
 
     // NOTE: We put the CanvasObserver in a member instead of inheriting from it
     // to avoid adding a vptr to CSSCanvasValue.
-    class CanvasObserverProxy : public CanvasObserver {
+    class CanvasObserverProxy FINAL : public CanvasObserver {
     public:
         CanvasObserverProxy(CSSCanvasValue* ownerValue) : m_ownerValue(ownerValue) { }
         virtual ~CanvasObserverProxy() { }
-        virtual void canvasChanged(HTMLCanvasElement* canvas, const FloatRect& changedRect)
+        virtual void canvasChanged(HTMLCanvasElement* canvas, const FloatRect& changedRect) OVERRIDE
         {
             m_ownerValue->canvasChanged(canvas, changedRect);
         }
-        virtual void canvasResized(HTMLCanvasElement* canvas)
+        virtual void canvasResized(HTMLCanvasElement* canvas) OVERRIDE
         {
             m_ownerValue->canvasResized(canvas);
         }
-        virtual void canvasDestroyed(HTMLCanvasElement* canvas)
+        virtual void canvasDestroyed(HTMLCanvasElement* canvas) OVERRIDE
         {
             m_ownerValue->canvasDestroyed(canvas);
         }
     private:
         CSSCanvasValue* m_ownerValue;
     };
 
     void canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect);
     void canvasResized(HTMLCanvasElement*);
     void canvasDestroyed(HTMLCanvasElement*);
 
     HTMLCanvasElement* element(Document*);
 
     CanvasObserverProxy m_canvasObserver;
 
     // The name of the canvas.
     String m_name;
     // The document supplies the element and owns it.
     HTMLCanvasElement* m_element;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCanvasValue, isCanvasValue());
 
 } // namespace WebCore
 
 #endif // CSSCanvasValue_h