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

sdk/lib/_internal/pub_generated/test/global/binstubs/binstub_runs_precompiled_snapshot_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 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration("the binstubs runs a precompiled snapshot if present", () {
     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');")
-        ])
-      ]);
+      },
+          contents: [
+              d.dir("bin", [d.file("script.dart", "main(args) => print('ok');")])]);
     });
 
     schedulePub(args: ["global", "activate", "foo"]);
 
-    d.dir(cachePath, [
-      d.dir("bin", [
-        d.matcherFile(binStubName("foo-script"),
-            contains("script.dart.snapshot"))
-      ])
-    ]).validate();
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                "bin",
+                [
+                    d.matcherFile(
+                        binStubName("foo-script"),
+                        contains("script.dart.snapshot"))])]).validate();
   });
 }