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Currently if sync is turned off (but keeps metadata) the sharing message
bridge will invoke a callback but continue sending messages after sync
is turned on.

In this patch the bridge stops tracking of entities when sync is turned
off in all cases.

Bug: 1060169
Change-Id: Id5ba8305b3e492cd99d2f4929911ac521972f98d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095104
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Reviewed-by: vitaliii <vitaliii@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748884}