Update platform classes to use OVERRIDE / FINAL when needed

Source/platform/graphics/CrossfadeGeneratedImage.h

 /*
  * Copyright (C) 2011 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 25 matching lines @@
 
 class CSSCrossfadeValue;
 
 class PLATFORM_EXPORT CrossfadeGeneratedImage : public GeneratedImage {
 public:
     static PassRefPtr<CrossfadeGeneratedImage> create(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize& size)
     {
         return adoptRef(new CrossfadeGeneratedImage(fromImage, toImage, percentage, crossfadeSize, size));
     }
 
-    virtual void setContainerSize(const IntSize&) { }
-    virtual bool usesContainerSize() const { return false; }
-    virtual bool hasRelativeWidth() const { return false; }
-    virtual bool hasRelativeHeight() const { return false; }
+    virtual void setContainerSize(const IntSize&) OVERRIDE { }
+    virtual bool usesContainerSize() const OVERRIDE { return false; }
+    virtual bool hasRelativeWidth() const OVERRIDE { return false; }
+    virtual bool hasRelativeHeight() const OVERRIDE { return false; }
 
-    virtual IntSize size() const { return m_crossfadeSize; }
+    virtual IntSize size() const OVERRIDE { return m_crossfadeSize; }
 
 protected:
     virtual void draw(GraphicsContext*, const FloatRect&, const FloatRect&,
         CompositeOperator, blink::WebBlendMode) OVERRIDE;
     virtual void drawPattern(GraphicsContext*, const FloatRect&,
         const FloatSize&, const FloatPoint&, CompositeOperator,
         const FloatRect&, blink::WebBlendMode, const IntSize& repeatSpacing) OVERRIDE;
 
     CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize&);
 
 private:
     void drawCrossfade(GraphicsContext*);
 
     Image* m_fromImage;
     Image* m_toImage;
 
     float m_percentage;
     IntSize m_crossfadeSize;
 };
 
 }
 
 #endif