Avoid dangling FormEventLogger pointer in CreditCardAccessManager.

This CL changes the BrowserAutofillManager::Reset to reset the
CreditCardAccessManager prior to destroying the FormEventLogger, as
the former keeps a raw pointer to the latter.

Bug: 1468967
Change-Id: I37c27f0fb72a61009ac85ae954a8ec8a93afa653
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4748222
Auto-Submit: Jan Keitel <jkeitel@google.com>
Commit-Queue: Florian Leimgruber <fleimgruber@google.com>
Commit-Queue: Jan Keitel <jkeitel@google.com>
Reviewed-by: Florian Leimgruber <fleimgruber@google.com>
Cr-Commit-Position: refs/heads/main@{#1179535}