38dc4ed707
Migrate library and tests to null safety. Issue: https://github.com/dart-lang/sdk/issues/46617 Change-Id: I6657ebdeda7c9b4650cc6286229d2f4babdca5be Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250260 Commit-Queue: Nicholas Shahan <nshahan@google.com> Reviewed-by: Anna Gringauze <annagrin@google.com>