Revert "Use scheduled_test for Pub tests."

utils/tests/pub/install/git/check_out_branch_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('checks out a package at a specific branch from Git', () {
     ensureGit();
 
-    var repo = d.git('foo.git', [
-      d.libDir('foo', 'foo 1'),
-      d.libPubspec('foo', '1.0.0')
+    var repo = git('foo.git', [
+      libDir('foo', 'foo 1'),
+      libPubspec('foo', '1.0.0')
     ]);
-    repo.create();
-    repo.runGit(["branch", "old"]);
+    repo.scheduleCreate();
+    repo.scheduleGit(["branch", "old"]);
 
-    d.git('foo.git', [
-      d.libDir('foo', 'foo 2'),
-      d.libPubspec('foo', '1.0.0')
-    ]).commit();
+    git('foo.git', [
+      libDir('foo', 'foo 2'),
+      libPubspec('foo', '1.0.0')
+    ]).scheduleCommit();
 
-    d.appDir([{"git": {"url": "../foo.git", "ref": "old"}}]).create();
+    appDir([{"git": {"url": "../foo.git", "ref": "old"}}]).scheduleCreate();
 
     schedulePub(args: ['install'],
         output: new RegExp(r"Dependencies installed!$"));
 
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo 1";')
+    dir(packagesPath, [
+      dir('foo', [
+        file('foo.dart', 'main() => "foo 1";')
       ])
-    ]).validate();
+    ]).scheduleValidate();
   });
 }