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

Source/core/svg/SVGPathSegCurvetoQuadraticRel.h

Index: Source/core/svg/SVGPathSegCurvetoQuadraticRel.h
diff --git a/Source/core/svg/SVGPathSegCurvetoQuadraticRel.h b/Source/core/svg/SVGPathSegCurvetoQuadraticRel.h
index b0b386400365654920f610475af3be55cabdc301..5c06b86ee0d7eb60fde0d4f467d8a4aa1537cd5a 100644
--- a/Source/core/svg/SVGPathSegCurvetoQuadraticRel.h
+++ b/Source/core/svg/SVGPathSegCurvetoQuadraticRel.h
@@ -43,8 +43,8 @@ private:
     SVGPathSegCurvetoQuadraticRel(SVGPathElement* element, float x, float y, float x1, float y1)
         : SVGPathSegCurvetoQuadratic(element, x, y, x1, y1) { }
 
-    virtual unsigned short pathSegType() const override { return PATHSEG_CURVETO_QUADRATIC_REL; }
-    virtual String pathSegTypeAsLetter() const override { return "q"; }
+    unsigned short pathSegType() const override { return PATHSEG_CURVETO_QUADRATIC_REL; }
+    String pathSegTypeAsLetter() const override { return "q"; }
 };
 
 } // namespace blink