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Otherwise no sync happens on browser startup and changes made on other
computers only become visible after some syncable event is committed to the
sync local backend.

BUG=816379

Change-Id: I60c0fc8e67edd104fdc1a636abad2e829baf4f99
Reviewed-on: https://chromium-review.googlesource.com/1209622Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589907}