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

Source/core/svg/SVGPathSegCurvetoCubicRel.h

Index: Source/core/svg/SVGPathSegCurvetoCubicRel.h
diff --git a/Source/core/svg/SVGPathSegCurvetoCubicRel.h b/Source/core/svg/SVGPathSegCurvetoCubicRel.h
index 377dacb5ce92546e0d774c2185505df9ffd0d073..806c6fdf8651904c3f84a470dcc59ee99f726953 100644
--- a/Source/core/svg/SVGPathSegCurvetoCubicRel.h
+++ b/Source/core/svg/SVGPathSegCurvetoCubicRel.h
@@ -43,8 +43,8 @@ private:
     SVGPathSegCurvetoCubicRel(SVGPathElement* element, float x, float y, float x1, float y1, float x2, float y2)
         : SVGPathSegCurvetoCubic(element, x, y, x1, y1, x2, y2) { }
 
-    virtual unsigned short pathSegType() const override { return PATHSEG_CURVETO_CUBIC_REL; }
-    virtual String pathSegTypeAsLetter() const override { return "c"; }
+    unsigned short pathSegType() const override { return PATHSEG_CURVETO_CUBIC_REL; }
+    String pathSegTypeAsLetter() const override { return "c"; }
 };
 
 } // namespace blink