dart:io | Fix handling of exceptions from onBadCertificate callback.

tests/standalone/io/secure_server_socket_test.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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "package:expect/expect.dart";
@@ skipping 66 matching lines @@
 }
 
 void testSimpleConnectFail(String certificate, bool cancelOnError) {
   ReceivePort port = new ReceivePort();
   SecureServerSocket.bind(HOST_NAME, 0, certificate).then((server) {
     var clientEndFuture = SecureSocket.connect(HOST_NAME, server.port)
       .then((clientEnd) {
         Expect.fail("No client connection expected.");
       })
       .catchError((error) {
-        Expect.isTrue(error is HandshakeException);
+        Expect.isTrue(error is HandshakeException ||
+                      error is SocketException);
       });
     server.listen((serverEnd) {
       Expect.fail("No server connection expected.");
     },
     onError: (error) {
       Expect.isTrue(error is CertificateException);
       clientEndFuture.then((_) {
         if (!cancelOnError) server.close();
         port.close();
       });
@@ skipping 97 matching lines @@
   testInvalidBind();
   testSimpleConnect(CERTIFICATE);
   testSimpleConnect("CN=localhost");
   testSimpleConnectFail("not_a_nickname", false);
   testSimpleConnectFail("CN=notARealDistinguishedName", false);
   testSimpleConnectFail("not_a_nickname", true);
   testSimpleConnectFail("CN=notARealDistinguishedName", true);
   testServerListenAfterConnect();
   testSimpleReadWrite();
 }