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

sdk/lib/_internal/pub_generated/test/dart2js/minify_configuration_overrides_mode_test.dart

Index: sdk/lib/_internal/pub_generated/test/dart2js/minify_configuration_overrides_mode_test.dart
diff --git a/sdk/lib/_internal/pub/test/dart2js/minify_configuration_overrides_mode_test.dart b/sdk/lib/_internal/pub_generated/test/dart2js/minify_configuration_overrides_mode_test.dart
similarity index 70%
copy from sdk/lib/_internal/pub/test/dart2js/minify_configuration_overrides_mode_test.dart
copy to sdk/lib/_internal/pub_generated/test/dart2js/minify_configuration_overrides_mode_test.dart
index da0e6bcc302d4cbed7ecd75aef016f64c646b475..eca9f08f3a179dff46aa04e73b63db6972ab807f 100644
--- a/sdk/lib/_internal/pub/test/dart2js/minify_configuration_overrides_mode_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/dart2js/minify_configuration_overrides_mode_test.dart
@@ -9,17 +9,17 @@ import '../serve/utils.dart';
 main() {
   initConfig();
   integration("minify configuration overrides the mode", () {
-    d.dir(appPath, [
-      d.pubspec({
+    d.dir(appPath, [d.pubspec({
         "name": "myapp",
         "transformers": [{
-          "\$dart2js": {"minify": true}
-        }]
+            "\$dart2js": {
+              "minify": true
+            }
+          }]
       }),
-      d.dir("web", [
-        d.file("main.dart", "void main() => print('Hello!');")
-      ])
-    ]).create();
+          d.dir(
+              "web",
+              [d.file("main.dart", "void main() => print('Hello!');")])]).create();
 
     pubServe();
     requestShouldSucceed("main.dart.js", isMinifiedDart2JSOutput);