Use the new test runner.

test/dart2js/supports_configuration_with_build_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.
 
+// Dart2js can take a long time to compile dart code, so we increase the timeout
+// to cope with that.
+@Timeout.factor(3)
+
 import 'dart:convert';
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
-  initConfig();
   integration("compiles dart.js and interop.js next to entrypoints when "
               "dartjs is explicitly configured", () {
-    // Dart2js can take a long time to compile dart code, so we increase the
-    // timeout to cope with that.
-    currentSchedule.timeout *= 3;
-
     serve([
       d.dir('api', [
         d.dir('packages', [
           d.file('browser', JSON.encode({
             'versions': [packageVersionApiMap(packageMap('browser', '1.0.0'))]
           })),
           d.dir('browser', [
             d.dir('versions', [
               d.file('1.0.0', JSON.encode(
                   packageVersionApiMap(
@@ skipping 49 matching lines @@
             d.dir('browser', [
               d.file('dart.js', 'contents of dart.js'),
               d.file('interop.js', 'contents of interop.js')
             ])
           ]),
         ])
       ])
     ]).validate();
   });
 }