Update dart:io tests to use asyncStart/asyncEnd

tests/standalone/io/web_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 "dart:async";
+import "dart:io";
+import "dart:typed_data";
+
+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";
-import "dart:typed_data";
 
 const String CERT_NAME = 'localhost_cert';
 const String HOST_NAME = 'localhost';
 
 /**
  * A SecurityConfiguration lets us run the tests over HTTP or HTTPS.
  */
 class SecurityConfiguration {
   final bool secure;
 
@@ skipping 15 matching lines @@
                                        int closeStatus,
                                        String closeReason) {
     createServer().then((server) {
       server.transform(new WebSocketTransformer()).listen((webSocket) {
         webSocket.listen(
             webSocket.add,
             onDone: () {
               Expect.equals(closeStatus == null
                             ? WebSocketStatus.NO_STATUS_RECEIVED
                             : closeStatus, webSocket.closeCode);
-              Expect.equals(closeReason == null ? "" : closeReason, webSocket.closeReason);
+              Expect.equals(
+                  closeReason == null ? ""
+                                      : closeReason, webSocket.closeReason);
             });
         });
 
       int closeCount = 0;
       String messageText = "Hello, world!";
       for (int i = 0; i < totalConnections; i++) {
         int messageCount = 0;
         createClient(server.port).then((webSocket) {
           webSocket.add(messageText);
           webSocket.listen(
@@ skipping 179 matching lines @@
 
       createClient(server.port).catchError((error) {
         server.close();
       });
     });
   }
 
 
   void testUsePOST() {
     createServer().then((server) {
-      var errorPort = new ReceivePort();
+      asyncStart();
       server.transform(new WebSocketTransformer()).listen((webSocket) {
         Expect.fail("No connection expected");
       }, onError: (e) {
-        errorPort.close();
+        asyncEnd();
       });
 
       HttpClient client = new HttpClient();
       client.postUrl(Uri.parse(
           "${secure ? 'https:' : 'http:'}//$HOST_NAME:${server.port}/"))
         .then((request) => request.close())
         .then((response) {
           Expect.equals(HttpStatus.BAD_REQUEST, response.statusCode);
           client.close();
           server.close();
@@ skipping 143 matching lines @@
   SecureSocket.initialize(database: testPkcertDatabase,
                           password: "dartdart");
 }
 
 
 main() {
   new SecurityConfiguration(secure: false).runTests();
   initializeSSL();
   new SecurityConfiguration(secure: true).runTests();
 }