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

sdk/lib/_internal/pub_generated/test/get/hosted/stay_locked_test.dart

Index: sdk/lib/_internal/pub_generated/test/get/hosted/stay_locked_test.dart
diff --git a/sdk/lib/_internal/pub/test/get/hosted/stay_locked_test.dart b/sdk/lib/_internal/pub_generated/test/get/hosted/stay_locked_test.dart
similarity index 77%
copy from sdk/lib/_internal/pub/test/get/hosted/stay_locked_test.dart
copy to sdk/lib/_internal/pub_generated/test/get/hosted/stay_locked_test.dart
index a43ad2e06c44922a3f57b245eda54a9e97625d4a..befc73a81b4a3b0614667ca38e8034a1b107c192 100644
--- a/sdk/lib/_internal/pub/test/get/hosted/stay_locked_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/get/hosted/stay_locked_test.dart
@@ -13,16 +13,21 @@ import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration('keeps a pub server package locked to the version in the '
-      'lockfile', () {
+  integration(
+      'keeps a pub server package locked to the version in the ' 'lockfile',
+      () {
     servePackages((builder) => builder.serve("foo", "1.0.0"));
 
-    d.appDir({"foo": "any"}).create();
+    d.appDir({
+      "foo": "any"
+    }).create();
 
     // This should lock the foo dependency to version 1.0.0.
     pubGet();
 
-    d.packagesDir({"foo": "1.0.0"}).validate();
+    d.packagesDir({
+      "foo": "1.0.0"
+    }).validate();
 
     // Delete the packages path to simulate a new checkout of the application.
     schedule(() => deleteEntry(path.join(sandboxDir, packagesPath)));
@@ -33,6 +38,8 @@ main() {
     // This shouldn't upgrade the foo dependency due to the lockfile.
     pubGet();
 
-    d.packagesDir({"foo": "1.0.0"}).validate();
+    d.packagesDir({
+      "foo": "1.0.0"
+    }).validate();
   });
 }