Use the new test runner.

test/dart2js/supports_configuration_with_build_test.dart

Index: test/dart2js/supports_configuration_with_build_test.dart
diff --git a/test/dart2js/supports_configuration_with_build_test.dart b/test/dart2js/supports_configuration_with_build_test.dart
index 96501928bbaed4f09acc5d064acaf0a23d1bfd0b..5f6b8a7576b9027ee88cdf662c7f4571d42940a6 100644
--- a/test/dart2js/supports_configuration_with_build_test.dart
+++ b/test/dart2js/supports_configuration_with_build_test.dart
@@ -2,6 +2,10 @@
 // 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';
@@ -10,13 +14,8 @@ 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', [