Update rendering classes to use OVERRIDE / FINAL when needed

Source/core/rendering/RenderFrame.h

Index: Source/core/rendering/RenderFrame.h
diff --git a/Source/core/rendering/RenderFrame.h b/Source/core/rendering/RenderFrame.h
index 55391b98bd9da95eae4812de09b0162d05b4159a..9104214fe9e8a01b2bed9f7fcf21d9bae4b9d0d2 100644
--- a/Source/core/rendering/RenderFrame.h
+++ b/Source/core/rendering/RenderFrame.h
@@ -37,12 +37,12 @@ public:
     FrameEdgeInfo edgeInfo() const;
 
 private:
-    virtual const char* renderName() const { return "RenderFrame"; }
-    virtual bool isFrame() const { return true; }
+    virtual const char* renderName() const OVERRIDE { return "RenderFrame"; }
+    virtual bool isFrame() const OVERRIDE { return true; }
 
-    virtual void updateFromElement();
+    virtual void updateFromElement() OVERRIDE;
 
-    virtual void viewCleared();
+    virtual void viewCleared() OVERRIDE;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFrame, isFrame());