c0144141ce
There's no reason these classes need to be in test, and I want to re-use them in a tool for testing NNBD migrations. Change-Id: I43686a44d5f8d83f0d1cc23315746250eb766681 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/125485 Reviewed-by: Samuel Rawlins <srawlins@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>