Use the new test runner.

test/dart2js/includes_source_maps_if_sourceMaps_true_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
-  initConfig();
   integration("includes source maps in a release build if sourceMaps true", () {
     d.dir(appPath, [
       d.pubspec({
         'name': 'myapp',
         'transformers': [{
           '\$dart2js': {
             'sourceMaps': true
           }
         }]
       }),
@@ skipping 10 matching lines @@
       d.dir('build', [
         d.dir('web', [
           d.matcherFile('main.dart.js',
               contains("# sourceMappingURL=main.dart.js.map")),
           d.matcherFile('main.dart.js.map', contains('"file": "main.dart.js"'))
         ])
       ])
     ]).validate();
   });
 }