Update dart:io tests to use asyncStart/asyncEnd

tests/standalone/io/socket_upgrade_to_secure_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 "dart:async";
+import "dart:io";
+
+import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 import "package:path/path.dart";
-import "dart:async";
-import "dart:io";
-import "dart:isolate";
 
 const HOST_NAME = "localhost";
 const CERTIFICATE = "localhost_cert";
 
 // This test creates a server and a client connects. After connecting
 // and an optional initial handshake the connection is secured by
 // upgrading to a secure connection The client then writes and the
 // server echos. When the server has finished its echo it
 // half-closes. When the client gets the close event is closes fully.
 //
 // The test can be run in different configurations based on
 // the boolean arguments:
 //
 // handshakeBeforeSecure
 // When this argument is true some initial clear text handshake is done
 // between client and server before the connection is secured. This argument
 // only makes sense when both listenSecure and connectSecure are false.
 //
 // postponeSecure
 // When this argument is false the securing of the server end will
 // happen as soon as the last byte of the handshake before securing
 // has been written. When this argument is true the securing of the
 // server will not happen until the first TLS handshake data has been
 // received from the client. This argument only takes effect when
 // handshakeBeforeSecure is true.
 void test(bool hostnameInConnect,
           bool handshakeBeforeSecure,
           [bool postponeSecure = false]) {
-  ReceivePort port = new ReceivePort();
+  asyncStart();
 
   const messageSize = 1000;
   const handshakeMessageSize = 100;
 
   List<int> createTestData() {
     List<int> data = new List<int>(messageSize);
     for (int i = 0; i < messageSize; i++) {
       data[i] = i & 0xff;
     }
     return data;
@@ skipping 143 matching lines @@
               CERTIFICATE,
               bufferedData: carryOverData).then((secureClient) {
             client.add([0]);
             runServer(secureClient).then((_) => server.close());
           });
         });
       }
     });
 
     connectClient(server.port).then(runClient).then((socket) {
-      port.close();
+      asyncEnd();
     });
   }
 
   ServerSocket.bind(HOST_NAME, 0).then(serverReady);
 }
 
 main() {
   var certificateDatabase = join(dirname(Platform.script), 'pkcert');
   SecureSocket.initialize(database: certificateDatabase,
                           password: 'dartdart',
                           useBuiltinRoots: false);
   test(false, false);
   test(true, false);
   test(false, true);
   test(true, true);
   test(false, true, true);
   test(true, true, true);
 }