GitLab

We leverage the recently introduced layer that allows integrating
legacy SyncableService implementations within the newest architecture,
USS. This requires forking the custom controller, because a different
class hierarchy is used.

The new codepath is behind feature toggle
kSyncPseudoUSSHistoryDeleteDirectives.

Bug: 870624
Change-Id: Ief8fb0d5f5d0472aeea1e0edf42e905632bc33fb
Reviewed-on: https://chromium-review.googlesource.com/1251262Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595735}