Using Server Socket Reference causes SEGFAULT in eventhandler

[mkustermann]

Reproduction:

  main() {
    ServerSocket.bind('127.0.0.1', 0).then((mainServer) {
      mainServer.reference.create().then((refServer) {
        refServer.listen((_) {});
        Timer.run(() {
          mainServer.close();
          refServer.close();
        });
      });
    });
  }

$ dart repro.dart
zsh: segmentation fault (core dumped) ....

[mkustermann]

Should be fixed in r41276.

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Added Fixed label.