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

sdk/lib/_internal/pub_generated/test/validator/license_test.dart

 // Copyright (c) 2013, 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 'package:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../lib/src/entrypoint.dart';
 import '../../lib/src/io.dart';
 import '../../lib/src/validator.dart';
@@ skipping 24 matching lines @@
       expectNoValidationError(license);
     });
 
     integration('has a suffixed LICENSE file', () {
       schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
       d.file(path.join(appPath, 'LICENSE.md'), '').create();
       expectNoValidationError(license);
     });
   });
 
-  integration('should consider a package invalid if it has no LICENSE file',
+  integration(
+      'should consider a package invalid if it has no LICENSE file',
       () {
     d.validPackage.create();
     schedule(() => deleteEntry(path.join(sandboxDir, appPath, 'LICENSE')));
     expectValidationError(license);
   });
 }