Use the new test runner.

test/dart2js/environment_constant_test.dart

Index: test/dart2js/environment_constant_test.dart
diff --git a/test/dart2js/environment_constant_test.dart b/test/dart2js/environment_constant_test.dart
index dab1260f1abca74a83a6c0d0786caf98a5c46b0c..1128105a126c0327868a3fa973035369dafe6f61 100644
--- a/test/dart2js/environment_constant_test.dart
+++ b/test/dart2js/environment_constant_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 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
@@ -9,13 +13,8 @@ import '../serve/utils.dart';
 import '../test_pub.dart';
 
 main() {
-  initConfig();
   group("passes environment constants to dart2js", () {
     setUp(() {
-      // Dart2js can take a long time to compile dart code, so we increase the
-      // timeout to cope with that.
-      currentSchedule.timeout *= 3;
-
       d.dir(appPath, [
         d.appPubspec(),
         d.dir('web', [