Use fields in hidden native DOM classes instead of getters/setters.

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

 
 class _HTMLTableColElementJs extends _HTMLElementJs implements HTMLTableColElement native "*HTMLTableColElement" {
 
-  String get align() native "return this.align;";
+  String align;
 
-  void set align(String value) native "this.align = value;";
+  String ch;
 
-  String get ch() native "return this.ch;";
+  String chOff;
 
-  void set ch(String value) native "this.ch = value;";
+  int span;
 
-  String get chOff() native "return this.chOff;";
+  String vAlign;
 
-  void set chOff(String value) native "this.chOff = value;";
-
-  int get span() native "return this.span;";
-
-  void set span(int value) native "this.span = value;";
-
-  String get vAlign() native "return this.vAlign;";
-
-  void set vAlign(String value) native "this.vAlign = value;";
-
-  String get width() native "return this.width;";
-
-  void set width(String value) native "this.width = value;";
+  String width;
 }