Working on this

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b07cbd614977bd0a67bd941303d0b50596715996

commit b07cbd614977bd0a67bd941303d0b50596715996
Author: Sergio Villar Senin <svillar@igalia.com>
Date: Fri Oct 19 13:50:43 2018

[chromeos] Convert user_session_manager.cc to IdentityManager

It was using SigninManager API to get account info and also to check
whether there was a the primary (authenticated) account
available. Migrated to IdentityManager API so it could eventually use
the identity service.

Bug:  890773 
Change-Id: Ic6ed0bfbadbfdead2541571d4ede9c91c24f0077
Reviewed-on: https://chromium-review.googlesource.com/c/1286652
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Sergio Villar <svillar@igalia.com>
Cr-Commit-Position: refs/heads/master@{#601132}
[modify] https://crrev.com/b07cbd614977bd0a67bd941303d0b50596715996/chrome/browser/chromeos/login/session/user_session_manager.cc

Closing