Update SVG classes to use OVERRIDE / FINAL when needed

Source/core/svg/SVGLineElement.h

Index: Source/core/svg/SVGLineElement.h
diff --git a/Source/core/svg/SVGLineElement.h b/Source/core/svg/SVGLineElement.h
index f01dc19b6b07cc64ab3cfa41b23326cf86b35d6a..1c0f041a698c36db33dddc033a75ce481087b91e 100644
--- a/Source/core/svg/SVGLineElement.h
+++ b/Source/core/svg/SVGLineElement.h
@@ -40,16 +40,16 @@ public:
 private:
     explicit SVGLineElement(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 supportsMarkers() const { return true; }
+    virtual bool supportsMarkers() const OVERRIDE { return true; }
 
-    virtual bool selfHasRelativeLengths() const;
+    virtual bool selfHasRelativeLengths() const OVERRIDE;
 
     RefPtr<SVGAnimatedLength> m_x1;
     RefPtr<SVGAnimatedLength> m_y1;