This reverts commit 21535e540f.
Reason for revert: VM test bots are failing and the approval system is down so I can't turn them green again. Reverting until I can approve the failures.
Original change's description:
> [tests] Add tests for generic function type bounds with null safety
>
> Testing that type arguments bounded by legacy types are equivalent
> with nullable and non-nullable versions of the same types.
>
> Change-Id: Ibd1166af68a74041920940789464cbb8afb091ec
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/132969
> Commit-Queue: Nicholas Shahan <nshahan@google.com>
> Reviewed-by: Bob Nystrom <rnystrom@google.com>
> Reviewed-by: Erik Ernst <eernst@google.com>
TBR=leafp@google.com,rnystrom@google.com,eernst@google.com,nshahan@google.com
Change-Id: Iad45fcd1498bdd46bfb908cd40df7ca38ef47d2d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/134461
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Commit-Queue: Nicholas Shahan <nshahan@google.com>
f831f121d7