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

sdk/lib/_internal/pub_generated/test/list_package_dirs/no_lockfile_test.dart

Index: sdk/lib/_internal/pub_generated/test/list_package_dirs/no_lockfile_test.dart
diff --git a/sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart b/sdk/lib/_internal/pub_generated/test/list_package_dirs/no_lockfile_test.dart
similarity index 59%
copy from sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart
copy to sdk/lib/_internal/pub_generated/test/list_package_dirs/no_lockfile_test.dart
index 397e4a2b883dbb77a81581b0e130598cc88e63e6..7bc95704465a791c4ae96f16871c13048f41c020 100644
--- a/sdk/lib/_internal/pub/test/list_package_dirs/no_lockfile_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/list_package_dirs/no_lockfile_test.dart
@@ -9,15 +9,10 @@ import '../test_pub.dart';
 main() {
   initConfig();
   integration('with no lockfile, exits with error', () {
-    d.dir(appPath, [
-      d.appPubspec()
-    ]).create();
+    d.dir(appPath, [d.appPubspec()]).create();
 
-    schedulePub(args: ["list-package-dirs", "--format=json"],
-        outputJson: {
-          "error":
-            'Package "myapp" has no lockfile. Please run "pub get" first.'
-        },
-        exitCode: exit_codes.DATA);
+    schedulePub(args: ["list-package-dirs", "--format=json"], outputJson: {
+      "error": 'Package "myapp" has no lockfile. Please run "pub get" first.'
+    }, exitCode: exit_codes.DATA);
   });
-}
+}