Don't emit errors from the socket when we are closing it down.

runtime/bin/socket_patch.dart

 // 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.
 
 patch class RawServerSocket {
   /* patch */ static Future<RawServerSocket> bind(address,
                                                   int port,
                                                   {int backlog: 0,
                                                    bool v6Only: false}) {
     return _RawServerSocket.bind(address, port, backlog, v6Only);
@@ skipping 466 matching lines @@
         }
 
         // Don't call the in handler if there is no data available
         // after all.
         if (i == READ_EVENT &&
             typeFlags != TYPE_LISTENING_SOCKET &&
             available() == 0) {
           continue;
         }
         if (i == ERROR_EVENT) {
-          reportError(nativeGetError(), "");
+          if (!isClosing) {
+            reportError(nativeGetError(), "");
+          }
         } else if (!isClosed) {
           // If the connection is closed right after it's accepted, there's a
           // chance the close-handler is not set.
           if (handler != null) handler();
         }
       }
     }
     if (isClosedRead && isClosedWrite) close();
     canActivateEvents = true;
     activateHandlers();
@@ skipping 715 matching lines @@
     if (_detachReady != null) {
       _detachReady.complete(null);
     } else {
       if (_raw != null) {
         _raw.shutdown(SocketDirection.SEND);
         _disableWriteEvent();
       }
     }
   }
 }