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

Source/platform/graphics/BitmapImageTest.cpp

Index: Source/platform/graphics/BitmapImageTest.cpp
diff --git a/Source/platform/graphics/BitmapImageTest.cpp b/Source/platform/graphics/BitmapImageTest.cpp
index 19c0c3eb48d0ea9ada367686f33e0ec52fd8c47e..d9e87ed5ee6b96d14463a05511bf1cb6675fdeca 100644
--- a/Source/platform/graphics/BitmapImageTest.cpp
+++ b/Source/platform/graphics/BitmapImageTest.cpp
@@ -51,9 +51,9 @@ public:
         {
             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&) { }
 
@@ -122,7 +122,7 @@ public:
     }
 
 protected:
-    virtual void SetUp() override
+    void SetUp() override
     {
         DeferredImageDecoder::setEnabled(m_enableDeferredDecoding);
         m_image = BitmapImage::create(&m_imageObserver);