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

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

 
 class SVGRect native "*SVGRect" {
 
-  num height;
+  num get height() native "return this.height;";
 
-  num width;
+  void set height(num value) native "this.height = value;";
 
-  num x;
+  num get width() native "return this.width;";
 
-  num y;
+  void set width(num value) native "this.width = value;";
+
+  num get x() native "return this.x;";
+
+  void set x(num value) native "this.x = value;";
+
+  num get y() native "return this.y;";
+
+  void set y(num value) native "this.y = value;";
 
   var dartObjectLocalStorage;
 
   String get typeName() native;
 }