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

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

Index: sdk/lib/_internal/pub_generated/test/run/does_not_run_on_transformer_error_test.dart
diff --git a/sdk/lib/_internal/pub/test/run/does_not_run_on_transformer_error_test.dart b/sdk/lib/_internal/pub_generated/test/run/does_not_run_on_transformer_error_test.dart
similarity index 82%
copy from sdk/lib/_internal/pub/test/run/does_not_run_on_transformer_error_test.dart
copy to sdk/lib/_internal/pub_generated/test/run/does_not_run_on_transformer_error_test.dart
index 3ae0a1e14bf8c94a0c262804adaa44284127bf49..7d3bb786e4dea4721ad12ad3a49c70d631546fc5 100644
--- a/sdk/lib/_internal/pub/test/run/does_not_run_on_transformer_error_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/run/does_not_run_on_transformer_error_test.dart
@@ -33,20 +33,12 @@ main() {
   initConfig();
   withBarbackVersions("any", () {
     integration('does not run if a transformer has an error', () {
-      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.dir("bin", [
-          d.file("script.dart", SCRIPT)
-        ])
-      ]).create();
+            d.dir("lib", [d.dir("src", [d.file("transformer.dart", TRANSFORMER)])]),
+            d.dir("bin", [d.file("script.dart", SCRIPT)])]).create();
 
       createLockFile('myapp', pkg: ['barback']);