Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/dart2js/doesnt_support_invalid_type_for_boolean_option_test.dart

Index: sdk/lib/_internal/pub_generated/test/dart2js/doesnt_support_invalid_type_for_boolean_option_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/dart2js/doesnt_support_invalid_type_for_boolean_option_test.dart b/sdk/lib/_internal/pub_generated/test/dart2js/doesnt_support_invalid_type_for_boolean_option_test.dart
deleted file mode 100644
index 61f5cc9c5a5bec5b62595f986069e96e3a46d137..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/dart2js/doesnt_support_invalid_type_for_boolean_option_test.dart
+++ /dev/null
@@ -1,29 +0,0 @@
-// 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.
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-import '../serve/utils.dart';
-
-main() {
-  initConfig();
-  integration("doesn't support invalid type for boolean option", () {
-    d.dir(appPath, [d.pubspec({
-        "name": "myapp",
-        "transformers": [{
-            "\$dart2js": {
-              "checked": "foo",
-            }
-          }]
-      }), d.dir("web", [d.file("main.dart", "void main() {}")])]).create();
-
-    var server = pubServe();
-    requestShould404("main.dart.js");
-    server.stderr.expect(
-        emitsLines(
-            'Build error:\n' 'Transform Dart2JS on myapp|web/main.dart threw error: '
-                'Invalid value for \$dart2js.checked: "foo" ' '(expected true or false).'));
-    endPubServe();
-  });
-}