Relax CHECK to allow kCanceledBeforeDispatch

This CHECK was a bit too strong before, and could get hit. Relax
to two possible cases, kNotCanceled or kCanceledBeforeDispatch.

Bug: 1307772
Change-Id: Ic8d591af38a7d1109f82efc072b4980a3dc2343e
Fixed: 1445329
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4563340


Commit-Queue: Mason Freed <masonf@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Auto-Submit: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1149316}