Dart SDK Spelling b, c, and d.

tests/standalone/io/http_bind_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.
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:convert';
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 
 testBindShared(String host, bool v6Only) async {
   asyncStart();
 
   // Sent a single request using a new HttpClient to ensure a new TCP
-  // connnection is used.
+  // connection is used.
   Future singleRequest(host, port, statusCode) async {
     var client = new HttpClient();
     var request = await client.open('GET', host, port, '/');
     var response = await request.close();
     await response.drain();
     Expect.equals(statusCode, response.statusCode);
     client.close(force: true);
   }
 
   Completer server1Request = new Completer();
@@ skipping 51 matching lines @@
 Future<bool> supportsIPV6() async {
   try {
     var socket = await ServerSocket.bind('::1', 0);
     await socket.close();
     return true;
   } catch (e) {
     print(e);
     return false;
   }
 }