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Before a sync cycle is complete, we don't know yet if the sync token is
actually valid, because sync may not have tried it yet.

This means that without this CL, if the user was in auth error state,
and Chrome starts, GetUploadToGoogleState reports that uploading to
Google is active until sync actually tries to push or pull some data.

BUG=830570

Change-Id: Id59157db5fd2b83c4bd073cdf61e7c9da0bc730b
Reviewed-on: https://chromium-review.googlesource.com/1000780Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Florian Uunk <feuunk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550129}