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

Source/platform/graphics/BitmapImage.h

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  *
  * 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.
@@ skipping 40 matching lines @@
     static PassRefPtr<BitmapImage> create(const SkBitmap&, ImageObserver* = 0);
 
     static PassRefPtr<BitmapImage> create(ImageObserver* observer = 0)
     {
         return adoptRef(new BitmapImage(observer));
     }
 
     // This allows constructing a BitmapImage with a forced non-default orientation.
     static PassRefPtr<BitmapImage> createWithOrientationForTesting(const SkBitmap&, ImageOrientation);
 
-    virtual ~BitmapImage();
+    ~BitmapImage() override;
 
     bool isBitmapImage() const override;
     bool isLazyDecodedBitmap() override;
     bool isImmutableBitmap() override;
 
     bool currentFrameHasSingleSecurityOrigin() const override;
 
     IntSize size() const override;
     IntSize sizeRespectingOrientation() const;
     bool getHotSpot(IntPoint&) const override;
     String filenameExtension() const override;
     bool dataChanged(bool allDataReceived) override;
 
     bool isAllDataReceived() const { return m_allDataReceived; }
     bool hasColorProfile() const;
 
     // It may look unusual that there's no start animation call as public API.
     // This because we start and stop animating lazily. Animation starts when
     // the image is rendered, and automatically pauses once all observers no
     // longer want to render the image.
     void stopAnimation() override;
     void resetAnimation() override;
     bool maybeAnimated() override;
 
-    virtual void setAnimationPolicy(ImageAnimationPolicy policy) override { m_animationPolicy = policy; }
-    virtual ImageAnimationPolicy animationPolicy() override { return m_animationPolicy; }
-    virtual void advanceTime(double deltaTimeInSeconds) override;
+    void setAnimationPolicy(ImageAnimationPolicy policy) override { m_animationPolicy = policy; }
+    ImageAnimationPolicy animationPolicy() override { return m_animationPolicy; }
+    void advanceTime(double deltaTimeInSeconds) override;
 
     bool bitmapForCurrentFrame(SkBitmap*) override;
     PassRefPtr<Image> imageForDefaultFrame() override;
     bool currentFrameKnownToBeOpaque() override;
     ImageOrientation currentFrameOrientation();
 
 #if ENABLE(ASSERT)
     bool notSolidColor() override;
 #endif
 
@@ skipping 106 matching lines @@
     bool m_sizeAvailable : 1; // Whether or not we can obtain the size of the first image frame yet from ImageIO.
     mutable bool m_hasUniformFrameSize : 1;
     mutable bool m_haveFrameCount : 1;
 };
 
 DEFINE_IMAGE_TYPE_CASTS(BitmapImage);
 
 } // namespace blink
 
 #endif