Use scheduled_test for Pub tests.

utils/tests/pub/install/git/require_pubspec_test.dart

 // Copyright (c) 2012, 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.
 
 library pub_tests;
 
 import 'dart:io';
 
+import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration('requires the dependency to have a pubspec', () {
     ensureGit();
 
-    git('foo.git', [
-      libDir('foo')
-    ]).scheduleCreate();
+    d.git('foo.git', [
+      d.libDir('foo')
+    ]).create();
 
-    appDir([{"git": "../foo.git"}]).scheduleCreate();
+    d.appDir([{"git": "../foo.git"}]).create();
 
     // TODO(nweiz): clean up this RegExp when either issue 4706 or 4707 is
     // fixed.
     schedulePub(args: ['install'],
         error: new RegExp('^Package "foo" doesn\'t have a '
             'pubspec.yaml file.'),
         exitCode: 1);
   });
 }