Update rendering classes to use OVERRIDE / FINAL when needed

Source/core/rendering/RenderCounter.h

Index: Source/core/rendering/RenderCounter.h
diff --git a/Source/core/rendering/RenderCounter.h b/Source/core/rendering/RenderCounter.h
index 85cdff3b643c9278ef5c2d9f920b01bb3285b6cd..15d2b518cbb47846006495b8621d02b4e6541cd6 100644
--- a/Source/core/rendering/RenderCounter.h
+++ b/Source/core/rendering/RenderCounter.h
@@ -43,12 +43,12 @@ public:
     void updateCounter();
 
 protected:
-    virtual void willBeDestroyed();
+    virtual void willBeDestroyed() OVERRIDE;
 
 private:
-    virtual const char* renderName() const;
-    virtual bool isCounter() const;
-    virtual PassRefPtr<StringImpl> originalText() const;
+    virtual const char* renderName() const OVERRIDE;
+    virtual bool isCounter() const OVERRIDE;
+    virtual PassRefPtr<StringImpl> originalText() const OVERRIDE;
 
     // Removes the reference to the CounterNode associated with this renderer.
     // This is used to cause a counter display update when the CounterNode tree changes.