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

sdk/lib/_internal/pub_generated/test/run/does_not_run_on_transformer_error_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';
 
 const SCRIPT = """
 main() {
   print("should not get here!");
@@ skipping 15 matching lines @@
     if (transform.primaryInput.id.path.startsWith("lib")) return;
     transform.logger.error('\${transform.primaryInput.id}.');
   }
 }
 """;
 
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration('does not run if a transformer has an error', () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/transformer"]
         }),
-        d.dir("lib", [
-          d.dir("src", [
-            d.file("transformer.dart", TRANSFORMER)
-          ])
-        ]),
-        d.dir("bin", [
-          d.file("script.dart", SCRIPT)
-        ])
-      ]).create();
+            d.dir("lib", [d.dir("src", [d.file("transformer.dart", TRANSFORMER)])]),
+            d.dir("bin", [d.file("script.dart", SCRIPT)])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       var pub = pubRun(args: ["script"]);
 
       pub.stderr.expect("[Error from Failing]:");
       pub.stderr.expect("myapp|bin/script.dart.");
 
       // Note: no output from the script.
       pub.shouldExit();
     });
   });
 }