GitLab

Notify AccountManager observers in lacros-chrome about account updates
in AccountManager in ash-chrome.

Bug: 1117478
Test: unit_tests --gtest_filter="*AccountManagerAshTest*"
Change-Id: Ibddec136dc428c6f07413e106a49cc5e16d227e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461272
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815922}