Move frog dart:dom from fields to getters/setters.

client/dom/generated/src/frog/SVGPathSegCurvetoCubicSmoothRel.dart

 
 class SVGPathSegCurvetoCubicSmoothRel extends SVGPathSeg native "*SVGPathSegCurvetoCubicSmoothRel" {
 
-  num x;
+  num get x() native "return this.x;";
 
-  num x2;
+  void set x(num value) native "this.x = value;";
 
-  num y;
+  num get x2() native "return this.x2;";
 
-  num y2;
+  void set x2(num value) native "this.x2 = value;";
+
+  num get y() native "return this.y;";
+
+  void set y(num value) native "this.y = value;";
+
+  num get y2() native "return this.y2;";
+
+  void set y2(num value) native "this.y2 = value;";
 }