Improve the error-propagation on socket streams

tests/standalone/io/http_server_socket_test.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2013, 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.
 
 import "dart:io";
 import "dart:isolate";
 import "dart:math";
 
 class ExpectedDataOutputStream implements OutputStream {
   ExpectedDataOutputStream(List<int> this._data,
                            int this._cutoff,
                            bool this._closeAsError,
                            SocketMock this._socket);
 
   void set onNoPendingWrites(void callback()) {
     _onNoPendingWrites = callback;
   }
 
+  void set onClosed(void callback()) {
+    // Not used in test.
+  }
+
   void set onError(void callback(e)) {
     _onError = callback;
   }
 
   bool write(List data, [bool copyBuffer = true]) {
     _onData(data);
     return true;
   }
 
   bool writeFrom(List data, [int offset = 0, int len]) {
@@ skipping 195 matching lines @@
       "GET / HTTP/1.1\r\nKeep-Alive: False\r\n\r\n",
       "HTTP/1.1 200 OK\r\ntransfer-encoding: chunked\r\nconnection: close"
       "\r\n\r\n0\r\n\r\n");
 
   server.close();
 }
 
 void main() {
   testSocketClose();
 }