[ios] Convert CHECK(..., base::NotFatalUntil::M131) to CHECK(...)

The current version of stable is M-134, so those CHECK(...) are
already unconditional, so remove the base::NotFatalUntil::M131.

Bug: none
Change-Id: Idc3cc39cd4d6283656fe08283836cb647686fcd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6445822
Reviewed-by: Louis Romero <lpromero@google.com>
Commit-Queue: Louis Romero <lpromero@google.com>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1445194}