Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/CSSStyleSheet.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 CSSStyleSheet extends StyleSheet {
 
-  CSSRuleList get cssRules();
+  final CSSRuleList cssRules;
 
-  CSSRule get ownerRule();
+  final CSSRule ownerRule;
 
-  CSSRuleList get rules();
+  final CSSRuleList rules;
 
   int addRule(String selector, String style, [int index]);
 
   void deleteRule(int index);
 
   int insertRule(String rule, int index);
 
   void removeRule(int index);
 }