Update SVG classes to use OVERRIDE / FINAL when needed

Source/core/svg/SVGCircleElement.h

Index: Source/core/svg/SVGCircleElement.h
diff --git a/Source/core/svg/SVGCircleElement.h b/Source/core/svg/SVGCircleElement.h
index 46e0f1b64abb657ce1bd219ba000beaef2e09edf..c91df5114796a1d20c900d591710c384d319140f 100644
--- a/Source/core/svg/SVGCircleElement.h
+++ b/Source/core/svg/SVGCircleElement.h
@@ -39,14 +39,14 @@ public:
 private:
     explicit SVGCircleElement(Document&);
 
-    virtual bool isValid() const { return SVGTests::isValid(); }
+    virtual bool isValid() const OVERRIDE { return SVGTests::isValid(); }
     virtual bool supportsFocus() const OVERRIDE { return hasFocusEventListeners(); }
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
-    virtual void svgAttributeChanged(const QualifiedName&);
+    virtual void svgAttributeChanged(const QualifiedName&) OVERRIDE;
 
-    virtual bool selfHasRelativeLengths() const;
+    virtual bool selfHasRelativeLengths() const OVERRIDE;
 
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;