Methods used:
- SigninManagerBase::GetAuthenticatedAccountInfo()

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1b7d347595fabc87c5bbabde9097664e96d2a671

commit 1b7d347595fabc87c5bbabde9097664e96d2a671
Author: Antonio Gomes <tonikitoo@igalia.com>
Date: Mon Nov 05 14:44:43 2018

[s13n][ios] Convert signin_interaction_controller.mm to IdentityManager

BUG= 889867 

Change-Id: I19a354a427ad67b8f1b8a5357b81f37dabdbb592
Reviewed-on: https://chromium-review.googlesource.com/c/1316934
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#605326}
[modify] https://crrev.com/1b7d347595fabc87c5bbabde9097664e96d2a671/ios/chrome/browser/ui/signin_interaction/BUILD.gn
[modify] https://crrev.com/1b7d347595fabc87c5bbabde9097664e96d2a671/ios/chrome/browser/ui/signin_interaction/signin_interaction_controller.mm