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

sdk/lib/_internal/pub_generated/test/run/ignores_explicit_dart2js_transformer_test.dart

Index: sdk/lib/_internal/pub_generated/test/run/ignores_explicit_dart2js_transformer_test.dart
diff --git a/sdk/lib/_internal/pub/test/run/ignores_explicit_dart2js_transformer_test.dart b/sdk/lib/_internal/pub_generated/test/run/ignores_explicit_dart2js_transformer_test.dart
similarity index 79%
copy from sdk/lib/_internal/pub/test/run/ignores_explicit_dart2js_transformer_test.dart
copy to sdk/lib/_internal/pub_generated/test/run/ignores_explicit_dart2js_transformer_test.dart
index ffeb779eab7ec07870e2488a154d45a711f40764..e3286e7d354347c54ab0812feefc48515f38cc32 100644
--- a/sdk/lib/_internal/pub/test/run/ignores_explicit_dart2js_transformer_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/run/ignores_explicit_dart2js_transformer_test.dart
@@ -8,15 +8,11 @@ import '../test_pub.dart';
 main() {
   initConfig();
   integration("doesn't choke on an explicit dart2js transformer", () {
-    d.dir(appPath, [
-      d.pubspec({
+    d.dir(appPath, [d.pubspec({
         "name": "myapp",
         "transformers": [r"$dart2js"]
       }),
-      d.dir("bin", [
-        d.file("script.dart", "main() => print('Hello!');")
-      ])
-    ]).create();
+          d.dir("bin", [d.file("script.dart", "main() => print('Hello!');")])]).create();
 
     var pub = pubRun(args: ["script"]);
     pub.stdout.expect("Hello!");