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

sdk/lib/_internal/pub_generated/test/lish/preview_package_validation_has_a_warning_test.dart

Index: sdk/lib/_internal/pub_generated/test/lish/preview_package_validation_has_a_warning_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/lish/preview_package_validation_has_a_warning_test.dart b/sdk/lib/_internal/pub_generated/test/lish/preview_package_validation_has_a_warning_test.dart
deleted file mode 100644
index 4f229afe6bf9f7a9840cbcf4a3bbc7d776e68918..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/lish/preview_package_validation_has_a_warning_test.dart
+++ /dev/null
@@ -1,32 +0,0 @@
-// 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:scheduled_test/scheduled_test.dart';
-import 'package:scheduled_test/scheduled_server.dart';
-import 'package:scheduled_test/scheduled_stream.dart';
-
-import '../../lib/src/exit_codes.dart' as exit_codes;
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-  setUp(d.validPackage.create);
-
-  integration('preview package validation has a warning', () {
-    var pkg = packageMap("test_pkg", "1.0.0");
-    pkg["author"] = "Natalie Weizenbaum";
-    d.dir(appPath, [d.pubspec(pkg)]).create();
-
-    var server = new ScheduledServer();
-    var pub = startPublish(server, args: ['--dry-run']);
-
-    pub.shouldExit(exit_codes.SUCCESS);
-    pub.stderr.expect(consumeThrough('Suggestions:'));
-    pub.stderr.expect(
-        emitsLines(
-            '* Author "Natalie Weizenbaum" in pubspec.yaml should have an email '
-                'address\n' '  (e.g. "name <email>").\n' '\n' 'Package has 1 warning.'));
-  });
-}