b4779e8f72
This reverts commit d45c3d15cb.
Reason for revert: Please see https://buganizer.corp.google.com/issues/144304690
(This CL is dependent on https://dart-review.googlesource.com/c/sdk/+/124480 which caused the regression).
Original change's description:
> [VM/nnbd] Make Nullability and NNBDMode class enums to avoid name conflicts.
>
> Change-Id: Ic78d3f48964bb61cbd1d90a69fcd68b4f29071e4
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/124587
> Commit-Queue: Régis Crelier <regis@google.com>
> Reviewed-by: Alexander Markov <alexmarkov@google.com>
TBR=alexmarkov@google.com,regis@google.com
# Not skipping CQ checks because original CL landed > 1 day ago.
Change-Id: I24603236f04bd2ec1ad80789d78cca89e70fb1d1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/125101
Reviewed-by: Siva Annamalai <asiva@google.com>