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

sdk/lib/_internal/pub_generated/test/run/includes_parent_directories_of_entrypoint_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:path/path.dart' as path;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 const SCRIPT = r"""
 import '../../a.dart';
 import '../b.dart';
 main() {
   print("$a $b");
 }
 """;
 
 main() {
   initConfig();
-  integration('allows assets in parent directories of the entrypoint to be'
-      'accessed', () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("tool", [
-        d.file("a.dart", "var a = 'a';"),
-        d.dir("a", [
-          d.file("b.dart", "var b = 'b';"),
-          d.dir("b", [
-            d.file("app.dart", SCRIPT)
-          ])
-        ])
-      ])
-    ]).create();
+  integration(
+      'allows assets in parent directories of the entrypoint to be' 'accessed',
+      () {
+    d.dir(
+        appPath,
+        [
+            d.appPubspec(),
+            d.dir(
+                "tool",
+                [
+                    d.file("a.dart", "var a = 'a';"),
+                    d.dir(
+                        "a",
+                        [
+                            d.file("b.dart", "var b = 'b';"),
+                            d.dir("b", [d.file("app.dart", SCRIPT)])])])]).create();
 
     var pub = pubRun(args: [path.join("tool", "a", "b", "app")]);
     pub.stdout.expect("a b");
     pub.shouldExit();
   });
 }