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

sdk/lib/_internal/pub_generated/test/get/git/check_out_twice_test.dart

 // Copyright (c) 2012, 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.
 
 library pub_tests;
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('checks out a package from Git twice', () {
     ensureGit();
 
-    d.git('foo.git', [
-      d.libDir('foo'),
-      d.libPubspec('foo', '1.0.0')
-    ]).create();
+    d.git('foo.git', [d.libDir('foo'), d.libPubspec('foo', '1.0.0')]).create();
 
-    d.appDir({"foo": {"git": "../foo.git"}}).create();
+    d.appDir({
+      "foo": {
+        "git": "../foo.git"
+      }
+    }).create();
 
     pubGet();
 
-    d.dir(cachePath, [
-      d.dir('git', [
-        d.dir('cache', [d.gitPackageRepoCacheDir('foo')]),
-        d.gitPackageRevisionCacheDir('foo')
-      ])
-    ]).validate();
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                'git',
+                [
+                    d.dir('cache', [d.gitPackageRepoCacheDir('foo')]),
+                    d.gitPackageRevisionCacheDir('foo')])]).validate();
 
-    d.dir(packagesPath, [
-      d.dir('foo', [
-        d.file('foo.dart', 'main() => "foo";')
-      ])
-    ]).validate();
+    d.dir(
+        packagesPath,
+        [d.dir('foo', [d.file('foo.dart', 'main() => "foo";')])]).validate();
 
     // Verify that nothing breaks if we get a Git revision that's already
     // in the cache.
     pubUpgrade();
   });
 }