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

sdk/lib/_internal/pub_generated/test/dependency_computer/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.
 
 library pub_tests;
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../lib/src/exceptions.dart';
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 void main() {
   initConfig();
 
   integration("fails if an unknown package is imported", () {
-    d.dir(appPath, [
-      d.pubspec({
+    d.dir(appPath, [d.pubspec({
         "name": "myapp",
         "transformers": ["myapp"]
       }),
-      d.dir('lib', [
-        d.file("myapp.dart", transformer(["package:foo/foo.dart"]))
-      ])
-    ]).create();
+          d.dir(
+              'lib',
+              [d.file("myapp.dart", transformer(["package:foo/foo.dart"]))])]).create();
 
     expectException(predicate((error) {
       expect(error, new isInstanceOf<ApplicationException>());
-      expect(error.message, equals(
-          'A transformer imported unknown package "foo" (in '
-          '"package:foo/foo.dart").'));
+      expect(
+          error.message,
+          equals(
+              'A transformer imported unknown package "foo" (in '
+                  '"package:foo/foo.dart").'));
       return true;
     }));
   });
 
   integration("fails on a syntax error", () {
-    d.dir(appPath, [
-      d.pubspec({
+    d.dir(appPath, [d.pubspec({
         "name": "myapp",
         "transformers": ["myapp"]
-      }),
-      d.dir('lib', [
-        d.file("myapp.dart", "library;")
-      ])
-    ]).create();
+      }), d.dir('lib', [d.file("myapp.dart", "library;")])]).create();
 
     expectException(new isInstanceOf<AnalyzerErrorGroup>());
   });
 }