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

sdk/lib/_internal/pub_generated/test/barback/subdirectories_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 p;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../serve/utils.dart';
 import '../test_pub.dart';
 
 main() {
   initConfig();
 
   setUp(() {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("web", [
-        d.dir("one", [
-          d.dir("inner", [d.file("file.txt", "one")])
-        ]),
-        d.dir("two", [
-          d.dir("inner", [d.file("file.txt", "two")])
-        ]),
-        d.dir("nope", [
-          d.dir("inner", [d.file("file.txt", "nope")])
-        ])
-      ])
-    ]).create();
+    d.dir(
+        appPath,
+        [
+            d.appPubspec(),
+            d.dir(
+                "web",
+                [
+                    d.dir("one", [d.dir("inner", [d.file("file.txt", "one")])]),
+                    d.dir("two", [d.dir("inner", [d.file("file.txt", "two")])]),
+                    d.dir("nope", [d.dir("inner", [d.file("file.txt", "nope")])])])]).create();
   });
 
   var webOne = p.join("web", "one");
   var webTwoInner = p.join("web", "two", "inner");
 
   integration("builds subdirectories", () {
-    schedulePub(args: ["build", webOne, webTwoInner],
+    schedulePub(
+        args: ["build", webOne, webTwoInner],
         output: new RegExp(r'Built 2 files to "build".'));
 
-    d.dir(appPath, [
-      d.dir("build", [
-        d.dir("web", [
-          d.dir("one", [
-            d.dir("inner", [d.file("file.txt", "one")])
-          ]),
-          d.dir("two", [
-            d.dir("inner", [d.file("file.txt", "two")])
-          ]),
-          d.nothing("nope")
-        ])
-      ])
-    ]).validate();
+    d.dir(
+        appPath,
+        [
+            d.dir(
+                "build",
+                [
+                    d.dir(
+                        "web",
+                        [
+                            d.dir("one", [d.dir("inner", [d.file("file.txt", "one")])]),
+                            d.dir("two", [d.dir("inner", [d.file("file.txt", "two")])]),
+                            d.nothing("nope")])])]).validate();
   });
 
   integration("serves subdirectories", () {
     pubServe(args: [webOne, webTwoInner]);
 
     requestShouldSucceed("inner/file.txt", "one", root: webOne);
     requestShouldSucceed("file.txt", "two", root: webTwoInner);
     expectNotServed("web");
     expectNotServed(p.join("web", "three"));
 
     endPubServe();
   });
 }