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

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

Index: sdk/lib/_internal/pub_generated/test/serve/watch_added_file_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/watch_added_file_test.dart b/sdk/lib/_internal/pub_generated/test/serve/watch_added_file_test.dart
similarity index 72%
copy from sdk/lib/_internal/pub/test/serve/watch_added_file_test.dart
copy to sdk/lib/_internal/pub_generated/test/serve/watch_added_file_test.dart
index 7a42aa19f18f81a53b1be55b060b65549a41a53e..fa2063c04929d1ca887031b886fc4e30d91e8b47 100644
--- a/sdk/lib/_internal/pub/test/serve/watch_added_file_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/serve/watch_added_file_test.dart
@@ -11,22 +11,15 @@ import 'utils.dart';
 main() {
   initConfig();
   integration("picks up files added after serving started", () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("web", [
-        d.file("index.html", "body")
-      ])
-    ]).create();
+    d.dir(
+        appPath,
+        [d.appPubspec(), d.dir("web", [d.file("index.html", "body")])]).create();
 
     pubServe();
     waitForBuildSuccess();
     requestShouldSucceed("index.html", "body");
 
-    d.dir(appPath, [
-      d.dir("web", [
-        d.file("other.html", "added")
-      ])
-    ]).create();
+    d.dir(appPath, [d.dir("web", [d.file("other.html", "added")])]).create();
 
     waitForBuildSuccess();
     requestShouldSucceed("other.html", "added");