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

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

 
 class HTMLButtonElement extends HTMLElement native "*HTMLButtonElement" {
 
-  bool autofocus;
+  bool get autofocus() native "return this.autofocus;";
 
-  bool disabled;
+  void set autofocus(bool value) native "this.autofocus = value;";
 
-  HTMLFormElement form;
+  bool get disabled() native "return this.disabled;";
 
-  String formAction;
+  void set disabled(bool value) native "this.disabled = value;";
 
-  String formEnctype;
+  HTMLFormElement get form() native "return this.form;";
 
-  String formMethod;
+  String get formAction() native "return this.formAction;";
 
-  bool formNoValidate;
+  void set formAction(String value) native "this.formAction = value;";
 
-  String formTarget;
+  String get formEnctype() native "return this.formEnctype;";
 
-  NodeList labels;
+  void set formEnctype(String value) native "this.formEnctype = value;";
 
-  String name;
+  String get formMethod() native "return this.formMethod;";
 
-  String type;
+  void set formMethod(String value) native "this.formMethod = value;";
 
-  String validationMessage;
+  bool get formNoValidate() native "return this.formNoValidate;";
 
-  ValidityState validity;
+  void set formNoValidate(bool value) native "this.formNoValidate = value;";
 
-  String value;
+  String get formTarget() native "return this.formTarget;";
 
-  bool willValidate;
+  void set formTarget(String value) native "this.formTarget = value;";
+
+  NodeList get labels() native "return this.labels;";
+
+  String get name() native "return this.name;";
+
+  void set name(String value) native "this.name = value;";
+
+  String get type() native "return this.type;";
+
+  String get validationMessage() native "return this.validationMessage;";
+
+  ValidityState get validity() native "return this.validity;";
+
+  String get value() native "return this.value;";
+
+  void set value(String value) native "this.value = value;";
+
+  bool get willValidate() native "return this.willValidate;";
 
   bool checkValidity() native;
 
   void click() native;
 
   void setCustomValidity(String error) native;
 }