[Android][Passwords] Remove AccountSettings histogram

The histogram was added to look for anomalies, not required anymore.

OBSOLETE_HISTOGRAMS: Not required anymore.

Fixed: 331208251
Change-Id: I3c297db286eaf80adb92544b9f9d95e430597e1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5393065


Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Friedrich Horschig <fhorschig@chromium.org>
Commit-Queue: Adem Derinel <derinel@google.com>
Cr-Commit-Position: refs/heads/main@{#1278973}