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

sdk/lib/_internal/pub_generated/test/validator/size_test.dart

Index: sdk/lib/_internal/pub_generated/test/validator/size_test.dart
diff --git a/sdk/lib/_internal/pub/test/validator/size_test.dart b/sdk/lib/_internal/pub_generated/test/validator/size_test.dart
similarity index 90%
copy from sdk/lib/_internal/pub/test/validator/size_test.dart
copy to sdk/lib/_internal/pub_generated/test/validator/size_test.dart
index 9949280ef75ad17469de2a0f6c2630f099c5389a..15a4b06561baeb32bcf7ca55f08c0e46abca6d73 100644
--- a/sdk/lib/_internal/pub/test/validator/size_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/validator/size_test.dart
@@ -13,8 +13,7 @@ import '../test_pub.dart';
 import 'utils.dart';
 
 Function size(int size) {
-  return (entrypoint) =>
-      new SizeValidator(entrypoint, new Future.value(size));
+  return (entrypoint) => new SizeValidator(entrypoint, new Future.value(size));
 }
 
 main() {