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

sdk/lib/_internal/pub_generated/test/global/activate/outdated_binstub_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 'dart:async';
 
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_process.dart';
 import 'package:scheduled_test/scheduled_stream.dart';
@@ skipping 13 matching lines @@
 """;
 
 main() {
   initConfig();
   integration("an outdated binstub is replaced", () {
     servePackages((builder) {
       builder.serve("foo", "1.0.0", pubspec: {
         "executables": {
           "foo-script": "script"
         }
-      }, 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');")])]);
     });
 
     schedulePub(args: ["global", "activate", "foo"]);
 
-    d.dir(cachePath, [
-      d.dir('bin', [
-        d.file(binStubName('foo-script'), _OUTDATED_BINSTUB)
-      ])
-    ]).create();
+    d.dir(
+        cachePath,
+        [
+            d.dir('bin', [d.file(binStubName('foo-script'), _OUTDATED_BINSTUB)])]).create();
 
     schedulePub(args: ["global", "activate", "foo"]);
 
-    d.dir(cachePath, [
-      d.dir('bin', [
-        // 255 is the VM's exit code upon seeing an out-of-date snapshot.
-        d.matcherFile(binStubName('foo-script'), contains("255"))
-      ])
-    ]).validate();
+    d.dir(
+        cachePath,
+        [d.dir('bin', [// 255 is the VM's exit code upon seeing an out-of-date snapshot.
+        d.matcherFile(
+            binStubName('foo-script'),
+            contains("255"))])]).validate();
   });
 }