Use 'field' syntax in dart:dom interfaces.

client/dom/generated/src/interface/WebSocket.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 WebSocket extends EventTarget default _WebSocketFactoryProvider {
 
   WebSocket(String url);
 
   static final int CLOSED = 3;
 
   static final int CLOSING = 2;
 
   static final int CONNECTING = 0;
 
   static final int OPEN = 1;
 
-  String get URL();
+  final String URL;
 
-  String get binaryType();
+  String binaryType;
 
-  void set binaryType(String value);
+  final int bufferedAmount;
 
-  int get bufferedAmount();
+  final String extensions;
 
-  String get extensions();
+  final String protocol;
 
-  String get protocol();
+  final int readyState;
 
-  int get readyState();
-
-  String get url();
+  final String url;
 
   void addEventListener(String type, EventListener listener, [bool useCapture]);
 
   void close([int code, String reason]);
 
   bool dispatchEvent(Event evt);
 
   void removeEventListener(String type, EventListener listener, [bool useCapture]);
 
   bool send(String data);
 }