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

sdk/lib/_internal/pub_generated/test/run/runs_a_generated_script_test.dart

Index: sdk/lib/_internal/pub_generated/test/run/runs_a_generated_script_test.dart
diff --git a/sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart b/sdk/lib/_internal/pub_generated/test/run/runs_a_generated_script_test.dart
similarity index 77%
copy from sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart
copy to sdk/lib/_internal/pub_generated/test/run/runs_a_generated_script_test.dart
index cd29aa77a7577e034aa2bb93b30dc6a185ff3c25..4794c3770ab4005617b840ad305be7e4366a08ba 100644
--- a/sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/run/runs_a_generated_script_test.dart
@@ -27,16 +27,18 @@ main() {
   initConfig();
   withBarbackVersions("any", () {
     integration('runs a script generated from scratch by a transformer', () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/transformer"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", TRANSFORMER),
-          d.file("primary.in", "")
-        ])])
-      ]).create();
+            d.dir(
+                "lib",
+                [
+                    d.dir(
+                        "src",
+                        [
+                            d.file("transformer.dart", TRANSFORMER),
+                            d.file("primary.in", "")])])]).create();
 
       createLockFile('myapp', pkg: ['barback']);