Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/HTMLFieldSetElement.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 interface HTMLFieldSetElement extends HTMLElement {
 
-  HTMLFormElement get form();
+  final HTMLFormElement form;
 
-  String get validationMessage();
+  final String validationMessage;
 
-  ValidityState get validity();
+  final ValidityState validity;
 
-  bool get willValidate();
+  final bool willValidate;
 
   bool checkValidity();
 
   void setCustomValidity(String error);
 }