Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/descriptor/git.dart

 // Copyright (c) 2013, 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 descriptor.git;
 
 import 'dart:async';
 
 import 'package:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/descriptor.dart';
 
 import '../../lib/src/git.dart' as git;
 
 /// Describes a Git repository and its contents.
 class GitRepoDescriptor extends DirectoryDescriptor {
   GitRepoDescriptor(String name, List<Descriptor> contents)
       : super(name, contents);
 
   /// Creates the Git repository and commits the contents.
   Future create([String parent]) => schedule(() {
     return super.create(parent).then((_) {
-      return _runGitCommands(parent, [
-        ['init'],
-        ['add', '.'],
-        ['commit', '-m', 'initial commit']
-      ]);
+      return _runGitCommands(
+          parent,
+          [['init'], ['add', '.'], ['commit', '-m', 'initial commit']]);
     });
   }, 'creating Git repo:\n${describe()}');
 
   /// Writes this descriptor to the filesystem, than commits any changes from
   /// the previous structure to the Git repo.
   ///
   /// [parent] defaults to [defaultRoot].
   Future commit([String parent]) => schedule(() {
     return super.create(parent).then((_) {
-      return _runGitCommands(parent, [
-        ['add', '.'],
-        ['commit', '-m', 'update']
-      ]);
+      return _runGitCommands(
+          parent,
+          [['add', '.'], ['commit', '-m', 'update']]);
     });
   }, 'committing Git repo:\n${describe()}');
 
   /// Return a Future that completes to the commit in the git repository
   /// referred to by [ref] at the current point in the scheduled test run.
   ///
   /// [parent] defaults to [defaultRoot].
   Future<String> revParse(String ref, [String parent]) => schedule(() {
     return _runGit(['rev-parse', ref], parent).then((output) => output[0]);
   }, 'parsing revision $ref for Git repo:\n${describe()}');
@@ skipping 12 matching lines @@
     // Explicitly specify the committer information. Git needs this to commit
     // and we don't want to rely on the buildbots having this already set up.
     var environment = {
       'GIT_AUTHOR_NAME': 'Pub Test',
       'GIT_AUTHOR_EMAIL': 'pub@dartlang.org',
       'GIT_COMMITTER_NAME': 'Pub Test',
       'GIT_COMMITTER_EMAIL': 'pub@dartlang.org'
     };
 
     if (parent == null) parent = defaultRoot;
-    return git.run(args,
+    return git.run(
+        args,
         workingDir: path.join(parent, name),
         environment: environment);
   }
 }