GitLab

The legacy (pre-USS) implementation of session sync was the only
remaining user of this field and has been deleted recently, so let's
just remove the now unused API.

This is convenient for pseudo-USS (SyncableServiceBasedBridge) because
there is no need for additional plumbing to propagate this information
through (it wasn't actually properly populated prior to this patch).

Bug: 895455
Change-Id: I02a577978b5fd7a84ced4775cd200d0210928985
Reviewed-on: https://chromium-review.googlesource.com/c/1343003
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609715}