Updated SVGListPropertyHelper as per SVG2 Spec

Source/core/svg/SVGPathSegLinetoAbs.h

Index: Source/core/svg/SVGPathSegLinetoAbs.h
diff --git a/Source/core/svg/SVGPathSegLinetoAbs.h b/Source/core/svg/SVGPathSegLinetoAbs.h
index f9dc71e9c966f48c424fdb360c184bed92cfb255..67be86bacf30b5cb31c4e180246c10dd08563023 100644
--- a/Source/core/svg/SVGPathSegLinetoAbs.h
+++ b/Source/core/svg/SVGPathSegLinetoAbs.h
@@ -34,6 +34,11 @@ public:
         return adoptRefWillBeNoop(new SVGPathSegLinetoAbs(element, x, y));
     }
 
+    virtual PassRefPtrWillBeRawPtr<SVGPathSeg> clone() override
+    {
+        return adoptRefWillBeNoop(new SVGPathSegLinetoAbs(nullptr, x(), y()));
+    }
+
 private:
     SVGPathSegLinetoAbs(SVGPathElement* element, float x, float y)
         : SVGPathSegSingleCoordinate(element, x, y) { }