Use the new test runner.

test/global/activate/removes_old_lockfile_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('removes the 1.6-style lockfile', () {
     servePackages((builder) {
       builder.serve("foo", "1.0.0");
     });
 
     d.dir(cachePath, [
       d.dir('global_packages', [
         d.file('foo.lock', 'packages: {foo: {description: foo, source: hosted, '
             'version: "1.0.0"}}}')
       ])
     ]).create();
 
     schedulePub(args: ["global", "activate", "foo"]);
 
     d.dir(cachePath, [
       d.dir('global_packages', [
         d.nothing('foo.lock'),
         d.dir('foo', [d.matcherFile('pubspec.lock', contains('1.0.0'))])
       ])
     ]).validate();
   });
 }