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

Source/platform/graphics/BitmapImageTest.cpp

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 class BitmapImageTest : public ::testing::Test {
 public:
     class FakeImageObserver : public ImageObserver {
     public:
         FakeImageObserver() : m_lastDecodedSizeChangedDelta(0) { }
 
         virtual void decodedSizeChanged(const Image*, int delta)
         {
             m_lastDecodedSizeChangedDelta = delta;
         }
-        virtual void didDraw(const Image*) override { }
-        virtual bool shouldPauseAnimation(const Image*) override { return false; }
-        virtual void animationAdvanced(const Image*) override { }
+        void didDraw(const Image*) override { }
+        bool shouldPauseAnimation(const Image*) override { return false; }
+        void animationAdvanced(const Image*) override { }
 
         virtual void changedInRect(const Image*, const IntRect&) { }
 
         int m_lastDecodedSizeChangedDelta;
     };
 
     BitmapImageTest() : BitmapImageTest(false) { }
     BitmapImageTest(bool enableDeferredDecoding) : m_enableDeferredDecoding(enableDeferredDecoding) { }
 
     static PassRefPtr<SharedBuffer> readFile(const char* fileName)
@@ skipping 48 matching lines @@
     {
         m_image->advanceAnimation(0);
     }
 
     PassRefPtr<Image> imageForDefaultFrame()
     {
         return m_image->imageForDefaultFrame();
     }
 
 protected:
-    virtual void SetUp() override
+    void SetUp() override
     {
         DeferredImageDecoder::setEnabled(m_enableDeferredDecoding);
         m_image = BitmapImage::create(&m_imageObserver);
     }
 
     FakeImageObserver m_imageObserver;
     RefPtr<BitmapImage> m_image;
 
 private:
     bool m_enableDeferredDecoding;
@@ skipping 129 matching lines @@
     frameAtIndex(0);
 
     // Trying to destroy all data except an undecoded frame should go ahead and
     // destroy all other frames.
     setCurrentFrame(2);
     destroyDecodedData(false);
     EXPECT_EQ(-frameSize * 2, m_imageObserver.m_lastDecodedSizeChangedDelta);
 }
 
 } // namespace blink