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

sdk/lib/_internal/pub_generated/test/serve/does_not_get_first_if_git_url_did_not_change_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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';
 import 'utils.dart';
 
 main() {
   initConfig();
   integration("does not get first if a git dependency's url is unchanged", () {
-    d.git('foo.git', [
-      d.libPubspec('foo', '1.0.0'),
-      d.libDir("foo")
-    ]).create();
+    d.git('foo.git', [d.libPubspec('foo', '1.0.0'), d.libDir("foo")]).create();
 
     d.appDir({
-      "foo": {"git": "../foo.git"}
+      "foo": {
+        "git": "../foo.git"
+      }
     }).create();
 
     pubGet();
     pubServe(shouldGetFirst: false);
     requestShouldSucceed("packages/foo/foo.dart", 'main() => "foo";');
     endPubServe();
   });
 }