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

sdk/lib/_internal/pub_generated/test/global/run/missing_executable_arg_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 '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('fails if no executable was given', () {
-    schedulePub(args: ["global", "run"],
-        error: """
+    schedulePub(args: ["global", "run"], error: """
             Must specify an executable to run.
 
             Usage: pub global run <package>:<executable> [args...]
             -h, --help    Print this usage information.
                 --mode    Mode to run transformers in.
                           (defaults to "release")
 
             Run "pub help" to see global options.
-            """,
-        exitCode: exit_codes.USAGE);
+            """, exitCode: exit_codes.USAGE);
   });
 }