Implement onClosed on a socket output stream

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 415 matching lines @@
       if (reason != null) {
         data.addAll(
            _StringEncoders.encoder(Encoding.UTF_8).encodeString(reason));
       }
     }
     _sendFrame(_WebSocketOpcode.CLOSE, data);
 
     if (_closeReceived) {
       // Close the socket when the close frame has been sent - if it
       // does not take too long.
-      _socket.close(true);
-      _socket.outputStream.onNoPendingWrites = () {
+      _socket.outputStream.close();
+      _socket.outputStream.onClosed = () {
         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.
@@ skipping 278 matching lines @@
     }
     return true;
   }
 
   Function _onRequest;
   Function _onOpen;
   Function _onNoUpgrade;
   HttpClientConnection _conn;
   String _nonce;
 }