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

sdk/lib/_internal/pub_generated/test/global/binstubs/does_not_warn_if_on_path_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 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration("does not warn if the binstub directory is on the path", () {
     servePackages((builder) {
       builder.serve("foo", "1.0.0", pubspec: {
         "executables": {
           "script": null
         }
-      }, contents: [
-        d.dir("bin", [
-          d.file("script.dart", "main(args) => print('ok \$args');")
-        ])
-      ]);
+      },
+          contents: [
+              d.dir("bin", [d.file("script.dart", "main(args) => print('ok \$args');")])]);
     });
 
     // Add the test's cache bin directory to the path.
     var binDir = p.dirname(Platform.executable);
     var separator = Platform.operatingSystem == "windows" ? ";" : ":";
     var path = "${Platform.environment["PATH"]}$separator$binDir";
 
-    schedulePub(args: ["global", "activate", "foo"],
+    schedulePub(
+        args: ["global", "activate", "foo"],
         output: isNot(contains("is not on your path")),
-        environment: {"PATH": path});
+        environment: {
+      "PATH": path
+    });
   });
-}
+}