Convert password decryption log to be less verbose

This warning is very spammy, at least on Mac platforms:

[38348:35083:0325/174839.165078:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165119:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165131:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165144:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165156:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165537:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165557:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165570:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165638:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165652:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165664:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165675:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165686:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165697:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165855:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2
[38348:35083:0325/174839.165868:ERROR:login_database.cc(998)] Password decryption failed, encryption_result is 2


This converts `LOG(ERROR)` to `DLOG(WARNING)` to reduce the
log chatter.

Change-Id: I956d536696b353d16d204c9bae84f482322de8cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5398600


Auto-Submit: Mason Freed <masonf@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1280129}