Fix virtual/override/final usage in Source/core/svg/.

Source/core/svg/SVGPathSegCurvetoQuadraticSmoothRel.h

Index: Source/core/svg/SVGPathSegCurvetoQuadraticSmoothRel.h
diff --git a/Source/core/svg/SVGPathSegCurvetoQuadraticSmoothRel.h b/Source/core/svg/SVGPathSegCurvetoQuadraticSmoothRel.h
index f1d239b64bc8488b8e5638079245289e92090ef1..836025f76e7292aa96f1613be213cffba5588ee5 100644
--- a/Source/core/svg/SVGPathSegCurvetoQuadraticSmoothRel.h
+++ b/Source/core/svg/SVGPathSegCurvetoQuadraticSmoothRel.h
@@ -43,8 +43,8 @@ private:
     SVGPathSegCurvetoQuadraticSmoothRel(SVGPathElement* element, float x, float y)
         : SVGPathSegSingleCoordinate(element, x, y) { }
 
-    virtual unsigned short pathSegType() const override { return PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL; }
-    virtual String pathSegTypeAsLetter() const override { return "t"; }
+    unsigned short pathSegType() const override { return PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL; }
+    String pathSegTypeAsLetter() const override { return "t"; }
 };
 
 } // namespace blink