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

sdk/lib/_internal/pub_generated/test/serve/gets_first_if_transitive_dependency_is_not_installed_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 'package:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../lib/src/io.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
   initConfig();
   integration("gets first if a transitive dependency is not installed", () {
     servePackages((builder) => builder.serve("bar", "1.2.3"));
 
-    d.dir("foo", [
-      d.libPubspec("foo", "1.0.0", deps: {
+    d.dir("foo", [d.libPubspec("foo", "1.0.0", deps: {
         "bar": "any"
-      }),
-      d.libDir("foo")
-    ]).create();
+      }), d.libDir("foo")]).create();
 
     d.appDir({
-      "foo": {"path": "../foo"}
+      "foo": {
+        "path": "../foo"
+      }
     }).create();
 
     // Run pub to install everything.
     pubGet();
 
     // Delete the system cache so bar isn't installed any more.
     schedule(() => deleteEntry(path.join(sandboxDir, cachePath)));
 
     pubServe(shouldGetFirst: true);
     requestShouldSucceed("packages/bar/bar.dart", 'main() => "bar 1.2.3";');
     endPubServe();
   });
 }