Working on this...

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ad6c3125c95c374a2fae34a5de8ba981b3239fa0

commit ad6c3125c95c374a2fae34a5de8ba981b3239fa0
Author: Sergio Villar Senin <svillar@igalia.com>
Date: Fri Nov 16 09:53:34 2018

Convert supervised_user_service_unittest.cc to Identity service

Replace the calls to SigninManager API to the IdentityManager
one. It's now using a IdentityTestEnvironmentProfileAdaptor to create
the profile used by the tests.

Bug:  903883 
Change-Id: Idd2ff37cd4937307369f76783fdada9a9c770946
Reviewed-on: https://chromium-review.googlesource.com/c/1337332
Commit-Queue: Sergio Villar <svillar@igalia.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608713}
[modify] https://crrev.com/ad6c3125c95c374a2fae34a5de8ba981b3239fa0/chrome/browser/supervised_user/supervised_user_service_unittest.cc

Fixed now