The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0daefa1690499699793f6e0535d9b70e887d2aa8

commit 0daefa1690499699793f6e0535d9b70e887d2aa8
Author: Evan Stade <estade@chromium.org>
Date: Fri Aug 11 20:58:03 2017

Remove ash:: references and includes from chrome/browser/sync/

I believe these have been obsolete since ash and chromeos became
synonymous.

Bug:  724146 
Change-Id: Icac2077c91cbb1cc29c2824b5ec34ddd406a3e19
Reviewed-on: https://chromium-review.googlesource.com/610509
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Stanislav Chiknavaryan <stanisc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#493850}
[modify] https://crrev.com/0daefa1690499699793f6e0535d9b70e887d2aa8/chrome/browser/sync/DEPS
[modify] https://crrev.com/0daefa1690499699793f6e0535d9b70e887d2aa8/chrome/browser/sync/sync_error_notifier_ash.cc
[modify] https://crrev.com/0daefa1690499699793f6e0535d9b70e887d2aa8/chrome/browser/sync/sync_error_notifier_ash_unittest.cc
[modify] https://crrev.com/0daefa1690499699793f6e0535d9b70e887d2aa8/chrome/browser/sync/sync_error_notifier_factory_ash.cc