Fix virtual/override/final usage in Source/platform/.

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 23 matching lines @@
 
 namespace blink {
 
 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&) override { }
-    virtual bool usesContainerSize() const override { return false; }
-    virtual bool hasRelativeWidth() const override { return false; }
-    virtual bool hasRelativeHeight() const override { return false; }
+    void setContainerSize(const IntSize&) override { }
+    bool usesContainerSize() const override { return false; }
+    bool hasRelativeWidth() const override { return false; }
+    bool hasRelativeHeight() const override { return false; }
 
-    virtual IntSize size() const override { return m_crossfadeSize; }
+    IntSize size() const override { return m_crossfadeSize; }
 
 protected:
     void draw(SkCanvas*, const SkPaint&, const FloatRect&, const FloatRect&, RespectImageOrientationEnum, ImageClampingMode) override;
-    virtual void drawTile(GraphicsContext*, const FloatRect&) final;
+    void drawTile(GraphicsContext*, const FloatRect&) final;
 
     CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize&);
 
 private:
     void drawCrossfade(SkCanvas*, const SkPaint&, ImageClampingMode);
 
     Image* m_fromImage;
     Image* m_toImage;
 
     float m_percentage;
     IntSize m_crossfadeSize;
 };
 
 } // namespace blink
 
 #endif