Methods used:
- SigninManagerBase::GetAuthenticatedAccountInfo()

Taking this...

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b022b60e6d884cb080c93ccfdc9f0666205fddee

commit b022b60e6d884cb080c93ccfdc9f0666205fddee
Author: Sergio Villar Senin <svillar@igalia.com>
Date: Tue Nov 06 08:20:10 2018

Convert accounts_collection_view_controller.mm to IdentityManager

It was using SigninManagerBase::GetAuthenticatedAccountInfo(). Migrated
to IdentityManager::GetPrimaryAccountInfo().

Bug:  889868 
Change-Id: I87fac4ed2e087ed7ec054607ba5faa27234bf6eb
Reviewed-on: https://chromium-review.googlesource.com/c/1316733
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Sergio Villar <svillar@igalia.com>
Cr-Commit-Position: refs/heads/master@{#605628}
[modify] https://crrev.com/b022b60e6d884cb080c93ccfdc9f0666205fddee/ios/chrome/browser/ui/settings/accounts_collection_view_controller.mm

Closing after landing