Use http_multi_server for serving on localhost.

lib/src/runner/browser/server.dart

 // Copyright (c) 2015, 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.
 
 library test.runner.browser.server;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:http_multi_server/http_multi_server.dart';
 import 'package:path/path.dart' as p;
 import 'package:pool/pool.dart';
 import 'package:shelf/shelf.dart' as shelf;
 import 'package:shelf/shelf_io.dart' as shelf_io;
 import 'package:shelf_static/shelf_static.dart';
 import 'package:shelf_web_socket/shelf_web_socket.dart';
 
 import '../../backend/metadata.dart';
 import '../../backend/suite.dart';
 import '../../backend/test_platform.dart';
@@ skipping 116 matching lines @@
 
   BrowserServer._(String root, String packageRoot, Uri pubServeUrl, bool color)
       : _root = root == null ? p.current : root,
         _packageRoot = packageRootFor(root, packageRoot),
         _pubServeUrl = pubServeUrl,
         _compiledDir = pubServeUrl == null ? createTempDir() : null,
         _http = pubServeUrl == null ? null : new HttpClient(),
         _compilers = new CompilerPool(color: color);
 
   /// Starts the underlying server.
-  Future _load() {
+  Future _load() async {
     var cascade = new shelf.Cascade()
         .add(_webSocketHandler.handler);
 
     if (_pubServeUrl == null) {
       cascade = cascade
           .add(_createPackagesHandler())
           .add(_jsHandler.handler)
           .add(createStaticHandler(_root))
           .add(_wrapperHandler);
     }
 
     var pipeline = new shelf.Pipeline()
       .addMiddleware(nestingMiddleware(_secret))
       .addHandler(cascade.handler);
 
-    return shelf_io.serve(pipeline, 'localhost', 0).then((server) {
-      _server = server;
-    });
+    _server = await HttpMultiServer.loopback(0);
+    shelf_io.serveRequests(_server, pipeline);
   }
 
   /// Returns a handler that serves the contents of the "packages/" directory
   /// for any URL that contains "packages/".
   ///
   /// This is a factory so it can wrap a static handler.
   shelf.Handler _createPackagesHandler() {
     var staticHandler =
       createStaticHandler(_packageRoot, serveFilesOutsidePath: true);
 
@@ skipping 241 matching lines @@
       if (_pubServeUrl == null) {
         new Directory(_compiledDir).deleteSync(recursive: true);
       } else {
         _http.close();
       }
 
       _closeCompleter.complete();
     }).catchError(_closeCompleter.completeError);
   }
 }