[STTS]change model observer to only notify in the case of remote updates

Bug: 910390
Change-Id: Ib5b4228f6b7b04c2f14e65ad153236576734e134
Reviewed-on: https://chromium-review.googlesource.com/c/1476056
Commit-Queue: Jeffrey Cohen <jeffreycohen@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633308}
5 files changed