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

sdk/lib/_internal/pub_generated/test/barback/fails_on_overlapping_directories_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 'package:scheduled_test/scheduled_test.dart';
 
 import '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
   initConfig();
 
   setUp(() {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("web", [
-        d.dir("sub1", [
-          d.file("file.txt", "contents"),
-          d.dir("sub2", [
-            d.file("file.txt", "contents")
-          ]),
-          d.dir("sub3", [
-            d.file("file.txt", "contents")
-          ])
-        ])
-      ])
-    ]).create();
+    d.dir(
+        appPath,
+        [
+            d.appPubspec(),
+            d.dir(
+                "web",
+                [
+                    d.dir(
+                        "sub1",
+                        [
+                            d.file("file.txt", "contents"),
+                            d.dir("sub2", [d.file("file.txt", "contents")]),
+                            d.dir("sub3", [d.file("file.txt", "contents")])])])]).create();
   });
 
   var webSub1 = path.join("web", "sub1");
   var webSub1Sub2 = path.join("web", "sub1", "sub2");
   var webSub1Sub3 = path.join("web", "sub1", "sub3");
 
-  pubBuildAndServeShouldFail("if a superdirectory follows a subdirectory",
+  pubBuildAndServeShouldFail(
+      "if a superdirectory follows a subdirectory",
       args: [webSub1Sub2, webSub1],
       error: 'Directories "$webSub1Sub2" and "$webSub1" cannot overlap.',
       exitCode: exit_codes.USAGE);
 
-  pubBuildAndServeShouldFail("if a subdirectory follows a superdirectory",
+  pubBuildAndServeShouldFail(
+      "if a subdirectory follows a superdirectory",
       args: [webSub1, webSub1Sub2],
       error: 'Directories "$webSub1" and "$webSub1Sub2" cannot overlap.',
       exitCode: exit_codes.USAGE);
 
-  pubBuildAndServeShouldFail("if multiple directories overlap",
+  pubBuildAndServeShouldFail(
+      "if multiple directories overlap",
       args: [webSub1, webSub1Sub2, webSub1Sub3],
       error: 'Directories "$webSub1", "$webSub1Sub2" and "$webSub1Sub3" '
-             'cannot overlap.',
+          'cannot overlap.',
       exitCode: exit_codes.USAGE);
 }