ac212a05b6
Also uses some newer language features to cleanup nearby code. Change-Id: I542911cd21ac0d77692edd7734b694c92d341ded Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/346202 Reviewed-by: Tess Strickland <sstrickl@google.com> Commit-Queue: Ben Konyi <bkonyi@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com>