Don't report multiple read-closed events.

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 482 matching lines @@
     var result = nativeGetRemotePeer()[0];
     var type = new InternetAddressType._from(result[0]);
     return new _InternetAddress(type, result[1], null, result[2]);
   }
 
   // Multiplexes socket events to the socket handlers.
   void multiplex(int events) {
     canActivateEvents = false;
     for (int i = FIRST_EVENT; i <= LAST_EVENT; i++) {
       if (((events & (1 << i)) != 0)) {
+        if ((i == CLOSED_EVENT || i == READ_EVENT) && isClosedRead) continue;
         if (i == CLOSED_EVENT &&
             typeFlags != TYPE_LISTENING_SOCKET &&
             !isClosing &&
             !isClosed) {
           isClosedRead = true;
         }
 
         var handler = eventHandlers[i];
         if (i == DESTROYED_EVENT) {
           assert(!isClosed);
@@ skipping 760 matching lines @@
     if (_detachReady != null) {
       _detachReady.complete(null);
     } else {
       if (_raw != null) {
         _raw.shutdown(SocketDirection.SEND);
         _disableWriteEvent();
       }
     }
   }
 }