Update rendering classes to use OVERRIDE / FINAL when needed

Source/core/rendering/FilterEffectRenderer.h

Index: Source/core/rendering/FilterEffectRenderer.h
diff --git a/Source/core/rendering/FilterEffectRenderer.h b/Source/core/rendering/FilterEffectRenderer.h
index cbcc28abba6c0b584c1dc9627facd91e8a0c6754..3af071ed45c65a77e480e9e55cf6ef3ca72115ee 100644
--- a/Source/core/rendering/FilterEffectRenderer.h
+++ b/Source/core/rendering/FilterEffectRenderer.h
@@ -73,7 +73,7 @@ private:
     bool m_haveFilterEffect;
 };
 
-class FilterEffectRenderer : public Filter
+class FilterEffectRenderer FINAL : public Filter
 {
     WTF_MAKE_FAST_ALLOCATED;
 public:
@@ -87,7 +87,7 @@ public:
         m_sourceDrawingRegion = sourceImageRect;
         m_graphicsBufferAttached = false;
     }
-    virtual FloatRect sourceImageRect() const { return m_sourceDrawingRegion; }
+    virtual FloatRect sourceImageRect() const OVERRIDE { return m_sourceDrawingRegion; }
 
     GraphicsContext* inputContext();
     ImageBuffer* output() const { return lastEffect()->asImageBuffer(); }