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It's unused - in practice, the value is queried through
SyncClient::GetLocalSyncBackendFolder (which contains some extra logic).

Bug: none
Change-Id: Icc2dc605ea66ba86f6e6055c126739c37efbcb05
Reviewed-on: https://chromium-review.googlesource.com/c/1290275Reviewed-by: vitaliii <vitaliii@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601111}