Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/CharacterData.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 CharacterData extends Node {
 
-  String get data();
+  String data;
 
-  void set data(String value);
-
-  int get length();
+  final int length;
 
   void appendData(String data);
 
   void deleteData(int offset, int length);
 
   void insertData(int offset, String data);
 
   void replaceData(int offset, int length, String data);
 
   String substringData(int offset, int length);
 }