Remove most remaining CHECK(false)s

In most cases NOTREACHED() is now a better option. Also performs
dead-code removal.

Bug: 40122554
Change-Id: Ia0479bc9b347f8f60a3932ef16c8b99b87f34a71
Low-Coverage-Reason: OTHER Should-be-unreachable code
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6038981
Commit-Queue: Peter Boström <[email protected]>
Commit-Queue: Lei Zhang <[email protected]>
Auto-Submit: Peter Boström <[email protected]>
Owners-Override: Lei Zhang <[email protected]>
Reviewed-by: Lei Zhang <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1386708}
NOKEYCHECK=True
GitOrigin-RevId: c922632dc6a0ef1916d376a16b91351846283d6f
2 files changed