Fix DCHECK in LoginApiDataForNextLoginAttemptPrefCleaner

Bug: 1245787, 1245907
Change-Id: I3527234c4da2142e945fab5d3691df7ea870ab4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3137716


Commit-Queue: James Cook <jamescook@chromium.org>
Auto-Submit: Jit Yao Yap <jityao@google.com>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/main@{#917744}