Use the new test runner.

test/global/activate/reactivating_git_upgrades_test.dart

 // Copyright (c) 2014, 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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
-  initConfig();
   integration('ignores previously activated git commit',
         () {
     ensureGit();
 
     d.git('foo.git', [
       d.libPubspec("foo", "1.0.0")
     ]).create();
 
     schedulePub(args: ["global", "activate", "-sgit", "../foo.git"],
         output: allOf(
@@ skipping 18 matching lines @@
                   '"../foo.git".\n'
                 'Resolving dependencies...\n'
                 '+ foo 1.0.1 from git ../foo.git at '),
             // Specific revision number goes here.
             endsWith(
                 'Precompiling executables...\n'
                 'Loading source assets...\n'
                 'Activated foo 1.0.1 from Git repository "../foo.git".')));
   });
 }