"API replacement summary:
- AccountTrackerService::FindAccountInfoByEmail => IdentityManager::FindAccountInfoForAccountWithRefreshTokenByEmailAddress
"

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c382936c222d0f1dc732fbf478c3e47bffc68c98

commit c382936c222d0f1dc732fbf478c3e47bffc68c98
Author: Abhijeet Kandalkar <abhijeet@igalia.com>
Date: Tue Jan 22 04:29:42 2019

Replace use of AccountTrackerService form signin_manager_android.cc

This CL replaces AccountTrackerService::FindAccountInfoByEmail with
IdentityManager::FindAccountInfoForAccountWithRefreshTokenByEmailAddress.

Remove unused headers.

Bug:  922742 
Change-Id: Ided55ebf6761543d158601bb52b0095b7b12a55f
Reviewed-on: https://chromium-review.googlesource.com/c/1424104
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624725}
[modify] https://crrev.com/c382936c222d0f1dc732fbf478c3e47bffc68c98/chrome/browser/android/signin/signin_manager_android.cc