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

sdk/lib/_internal/pub_generated/test/validator/directory_test.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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../lib/src/entrypoint.dart';
 import '../../lib/src/validator.dart';
 import '../../lib/src/validator/directory.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 Validator directory(Entrypoint entrypoint) =>
-  new DirectoryValidator(entrypoint);
+    new DirectoryValidator(entrypoint);
 
 main() {
   initConfig();
 
   group('should consider a package valid if it', () {
     setUp(d.validPackage.create);
 
     integration('looks normal', () => expectNoValidationError(directory));
 
     integration('has a nested directory named "tools"', () {
-      d.dir(appPath, [
-        d.dir("foo", [d.dir("tools")])
-      ]).create();
+      d.dir(appPath, [d.dir("foo", [d.dir("tools")])]).create();
       expectNoValidationError(directory);
     });
   });
 
-  group('should consider a package invalid if it has a top-level directory '
-      'named', () {
+  group(
+      'should consider a package invalid if it has a top-level directory ' 'named',
+      () {
     setUp(d.validPackage.create);
 
     var names = [
-      "benchmarks", "docs", "examples", "sample", "samples", "tests", "tools"
-    ];
+        "benchmarks",
+        "docs",
+        "examples",
+        "sample",
+        "samples",
+        "tests",
+        "tools"];
 
     for (var name in names) {
       integration('"$name"', () {
         d.dir(appPath, [d.dir(name)]).create();
         expectValidationWarning(directory);
       });
     }
   });
 }