Taking this...

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/702ef185ea72a6b7d41dfa73dd6b38c19f0a2446

commit 702ef185ea72a6b7d41dfa73dd6b38c19f0a2446
Author: Sergio Villar Senin <svillar@igalia.com>
Date: Wed Oct 17 09:39:00 2018

Convert enterprise_util.cc to IdentityManager

It's currently using the SigninManager API to retrieve the currently
authenticated account's email. Replaced by the IdentityManager
equivalent API so it could eventually use the identity service.

Bug:  890777 
Change-Id: Ib2b8b46f529424dd413d843fb89deb5a493a599c
Reviewed-on: https://chromium-review.googlesource.com/c/1280426
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Commit-Queue: Sergio Villar <svillar@igalia.com>
Cr-Commit-Position: refs/heads/master@{#600329}
[modify] https://crrev.com/702ef185ea72a6b7d41dfa73dd6b38c19f0a2446/chrome/browser/interstitials/enterprise_util.cc

Done