Fix bug in web socket close handling

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.
 
 final String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 class _WebSocketMessageType {
   static final int NONE = 0;
   static final int BINARY = 1;
   static final int TEXT = 2;
@@ skipping 427 matching lines @@
         if (_closeTimer != null) _closeTimer.cancel();
         _socket.close();
       };
       _closeTimer = new Timer(5000, (t) {
         _socket.close();
       });
     } else {
       // Half close the socket and expect a close frame in response
       // before closing the socket. If a close frame does not arrive
       // within a reasonable amount of time just close the socket.
-      _socket.close(true);
+      _socket.outputStream.close();
       _closeTimer = new Timer(5000, (t) {
         _socket.close();
       });
     }
     _closeSent = true;
   }
 
   _onWebSocketMessageStart(int type) {
     _currentMessageType = type;
     if (_currentMessageType == _WebSocketMessageType.TEXT) {
@@ skipping 267 matching lines @@
     }
     return true;
   }
 
   Function _onRequest;
   Function _onOpen;
   Function _onNoUpgrade;
   HttpClientConnection _conn;
   String _nonce;
 }