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

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

Index: sdk/lib/_internal/pub_generated/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
diff --git a/sdk/lib/_internal/pub/test/get/hosted/unlock_if_version_doesnt_exist_test.dart b/sdk/lib/_internal/pub_generated/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
similarity index 73%
copy from sdk/lib/_internal/pub/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
copy to sdk/lib/_internal/pub_generated/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
index a3f57ff829131ce1346b7c84087ef4c111725850..76ba6a2674302658d9d3e4e6cd6edb4eb176b433 100644
--- a/sdk/lib/_internal/pub/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/get/hosted/unlock_if_version_doesnt_exist_test.dart
@@ -13,18 +13,25 @@ import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration('upgrades a locked pub server package with a nonexistent version',
+  integration(
+      'upgrades a locked pub server package with a nonexistent version',
       () {
     servePackages((builder) => builder.serve("foo", "1.0.0"));
 
-    d.appDir({"foo": "any"}).create();
+    d.appDir({
+      "foo": "any"
+    }).create();
     pubGet();
-    d.packagesDir({"foo": "1.0.0"}).validate();
+    d.packagesDir({
+      "foo": "1.0.0"
+    }).validate();
 
     schedule(() => deleteEntry(p.join(sandboxDir, cachePath)));
 
     servePackages((builder) => builder.serve("foo", "1.0.1"), replace: true);
     pubGet();
-    d.packagesDir({"foo": "1.0.1"}).validate();
+    d.packagesDir({
+      "foo": "1.0.1"
+    }).validate();
   });
 }