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

sdk/lib/_internal/pub_generated/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart

Index: sdk/lib/_internal/pub_generated/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart b/sdk/lib/_internal/pub_generated/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
similarity index 86%
copy from sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
copy to sdk/lib/_internal/pub_generated/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
index ae98d6685ecb33df2a2c9c4988d5ac770c29c02a..4e5052c6473d953ed6e64cc2e4872a0951b6db28 100644
--- a/sdk/lib/_internal/pub/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/transformer/fails_to_load_a_transform_with_a_syntax_error_test.dart
@@ -18,15 +18,13 @@ main() {
   // when attempting to rewrite its imports.
   withBarbackVersions("any", () {
     integration("fails to load a transform with a syntax 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", "syntax error")
-        ])])
-      ]).create();
+            d.dir(
+                "lib",
+                [d.dir("src", [d.file("transformer.dart", "syntax error")])])]).create();
 
       createLockFile('myapp', pkg: ['barback']);