Updated SVGListPropertyHelper as per SVG2 Spec

Source/core/svg/SVGPathSegArcAbs.h

Index: Source/core/svg/SVGPathSegArcAbs.h
diff --git a/Source/core/svg/SVGPathSegArcAbs.h b/Source/core/svg/SVGPathSegArcAbs.h
index 6d68132545b18ecd1f4ead50d1d736c2077754b8..f777b9aafd6b7a66dcd15bcf9f155b74f01f0c9d 100644
--- a/Source/core/svg/SVGPathSegArcAbs.h
+++ b/Source/core/svg/SVGPathSegArcAbs.h
@@ -34,6 +34,11 @@ public:
         return adoptRefWillBeNoop(new SVGPathSegArcAbs(element, x, y, r1, r2, angle, largeArcFlag, sweepFlag));
     }
 
+    PassRefPtrWillBeRawPtr<SVGPathSeg> clone() override
+    {
+        return adoptRefWillBeNoop(new SVGPathSegArcAbs(nullptr, x(), y(), r1(), r2(), angle(), largeArcFlag(), sweepFlag()));
+    }
+
 private:
     SVGPathSegArcAbs(SVGPathElement* element, float x, float y, float r1, float r2, float angle, bool largeArcFlag, bool sweepFlag)
         : SVGPathSegArc(element, x, y, r1, r2, angle, largeArcFlag, sweepFlag) { }