CL https://chromium-review.googlesource.com/c/chromium/src/+/1348672

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/573c74347c9bd325c07895a43517ddfb2a697d49

commit 573c74347c9bd325c07895a43517ddfb2a697d49
Author: Antonio Gomes <tonikitoo@igalia.com>
Date: Wed Nov 28 11:58:43 2018

[s13n] Convert auth_sync_observer.cc to IdentityManager

BUG= 907515 

Change-Id: I62fc67e47f53306f3dfcbbe2e3dc19383551d98b
Reviewed-on: https://chromium-review.googlesource.com/c/1348672
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#611658}
[modify] https://crrev.com/573c74347c9bd325c07895a43517ddfb2a697d49/chrome/browser/chromeos/login/signin/auth_sync_observer.cc