Make hashCode a getter and not a method.

runtime/bin/websocket_impl.dart

 // Copyright (c) 2012, 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.
 
 const String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 class _WebSocketMessageType {
   static const int NONE = 0;
   static const int BINARY = 1;
   static const int TEXT = 2;
@@ skipping 450 matching lines @@
       // before closing the socket. If a close frame does not arrive
       // within a reasonable amount of time just close the socket.
       _socket.outputStream.close();
       _closeTimer = new Timer(5000, (t) {
         _socket.close();
       });
     }
     _closeSent = true;
   }
 
-  int hashCode() => _hash;
+  int get hashCode => _hash;
 
   _onWebSocketMessageStart(int type) {
     _currentMessageType = type;
     if (_currentMessageType == _WebSocketMessageType.TEXT) {
       _decoder = _StringDecoders.decoder(Encoding.UTF_8);
     } else {
       _outputStream = new ListOutputStream();
     }
   }
 
@@ skipping 87 matching lines @@
   _StringDecoder _decoder;
   ListOutputStream _outputStream;
   bool _closeReceived = false;
   bool _closeSent = false;
 }
 
 
 class _WebSocketConnection
     extends _WebSocketConnectionBase implements WebSocketConnection {
   _WebSocketConnection(DetachedSocket detached) {
-    _hash = detached.socket.hashCode();
+    _hash = detached.socket.hashCode;
     _socketConnected(detached.socket);
     _startProcessing(detached.unparsedData);
   }
 }
 
 
 class _WebSocketHandler implements WebSocketHandler {
   void onRequest(HttpRequest request, HttpResponse response) {
     // Check that this is a web socket upgrade.
     if (!_isWebSocketUpgrade(request)) {
@@ skipping 274 matching lines @@
 
 class _WebSocketCloseEvent implements CloseEvent {
   _WebSocketCloseEvent(this._wasClean, this._code, this._reason);
   bool get wasClean => _wasClean;
   int get code => _code;
   String get reason => _reason;
   bool _wasClean;
   int _code;
   String _reason;
 }