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

sdk/lib/_internal/pub_generated/test/serve/defaults_to_debug_mode_test.dart

Index: sdk/lib/_internal/pub_generated/test/serve/defaults_to_debug_mode_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/defaults_to_debug_mode_test.dart b/sdk/lib/_internal/pub_generated/test/serve/defaults_to_debug_mode_test.dart
similarity index 83%
copy from sdk/lib/_internal/pub/test/serve/defaults_to_debug_mode_test.dart
copy to sdk/lib/_internal/pub_generated/test/serve/defaults_to_debug_mode_test.dart
index 5037824575898c46060687ef47d5dcf380cd3bfe..16b7de13a26d7622097098cf187044555f427b65 100644
--- a/sdk/lib/_internal/pub/test/serve/defaults_to_debug_mode_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/serve/defaults_to_debug_mode_test.dart
@@ -32,18 +32,12 @@ main() {
   initConfig();
   withBarbackVersions("any", () {
     integration("defaults to debug mode", () {
-      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("web", [
-          d.file("foo.txt", "foo")
-        ])
-      ]).create();
+            d.dir("lib", [d.dir("src", [d.file("transformer.dart", TRANSFORMER)])]),
+            d.dir("web", [d.file("foo.txt", "foo")])]).create();
 
       createLockFile('myapp', pkg: ['barback']);