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SessionSyncService's API is sufficient to achieve the desired
behavior, i.e. distinguish the exact state for tab sync: off,
initial download in progress and done. It also issues a
notification every time that state changes, so there's no need to
monitor updates from ProfileSyncService directly.

Bug: 895455
Change-Id: Icf66328fdde97f833e178f0571dedb248c91beca
Reviewed-on: https://chromium-review.googlesource.com/c/1344029Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612077}