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

sdk/lib/_internal/pub_generated/test/build/cleans_entire_build_directory_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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   initConfig();
 
   integration("cleans entire build directory before a build", () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir('example', [
-        d.file('file.txt', 'example')
-      ]),
-      d.dir('test', [
-        d.file('file.txt', 'test')
-      ])
-    ]).create();
+    d.dir(
+        appPath,
+        [
+            d.appPubspec(),
+            d.dir('example', [d.file('file.txt', 'example')]),
+            d.dir('test', [d.file('file.txt', 'test')])]).create();
 
     // Make a build directory containing "example".
-    schedulePub(args: ["build", "example"],
+    schedulePub(
+        args: ["build", "example"],
         output: new RegExp(r'Built 1 file to "build".'));
 
     // Now build again with just "test". Should wipe out "example".
-    schedulePub(args: ["build", "test"],
+    schedulePub(
+        args: ["build", "test"],
         output: new RegExp(r'Built 1 file to "build".'));
 
-    d.dir(appPath, [
-      d.dir('build', [
-        d.nothing('example'),
-        d.dir('test', [
-          d.file('file.txt', 'test')
-        ]),
-      ])
-    ]).validate();
+    d.dir(
+        appPath,
+        [
+            d.dir(
+                'build',
+                [
+                    d.nothing('example'),
+                    d.dir('test', [d.file('file.txt', 'test')]),])]).validate();
   });
 }