We probably need to migrate it to known users.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5dc99618a31f21158595a52d0e3caf51e5b1e3b4

commit 5dc99618a31f21158595a52d0e3caf51e5b1e3b4
Author: Colin Blundell <blundell@chromium.org>
Date: Fri Jan 12 07:30:15 2018

Convert components/suggestions to use Identity Service client library

This CL converts //components/suggestions from using //components/signin
to using the Identity Service client library. The conversion is
straightforward:

- Create PrimaryAccountAccessTokenFetcher via IdentityManager rather
  than directly.

I tested the relevant behavior manually by going to the NTP and
chrome://suggestions for a signed-in and syncing test user on
Linux/Android and confirming that their NTP tiles showed up after
this change identically to before this change.

Followup changes will introduce FakeIdentityManager and change
suggestions_service_impl_unittest.cc to use FakeIdentityManager rather
than using the underlying signin fakes.

Bug: 789049
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I1d2c84261552eb79390e009ae7331c5f3a8161e5
Reviewed-on: https://chromium-review.googlesource.com/847485
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528901}
[modify] https://crrev.com/5dc99618a31f21158595a52d0e3caf51e5b1e3b4/chrome/browser/search/suggestions/suggestions_service_factory.cc
[modify] https://crrev.com/5dc99618a31f21158595a52d0e3caf51e5b1e3b4/components/suggestions/BUILD.gn
[modify] https://crrev.com/5dc99618a31f21158595a52d0e3caf51e5b1e3b4/components/suggestions/suggestions_service_impl.cc
[modify] https://crrev.com/5dc99618a31f21158595a52d0e3caf51e5b1e3b4/components/suggestions/suggestions_service_impl.h
[modify] https://crrev.com/5dc99618a31f21158595a52d0e3caf51e5b1e3b4/components/suggestions/suggestions_service_impl_unittest.cc
[modify] https://crrev.com/5dc99618a31f21158595a52d0e3caf51e5b1e3b4/ios/chrome/browser/suggestions/BUILD.gn
[modify] https://crrev.com/5dc99618a31f21158595a52d0e3caf51e5b1e3b4/ios/chrome/browser/suggestions/suggestions_service_factory.mm

Triage nag: This Chrome OS bug has an owner but no component. Please add a component so that this can be tracked by the relevant team.

Jacob, could you help finding owner for this?