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ModelTypeController assumes that the user must be signed in by the time
a datatype gets started. This however doesn't hold true for local sync,
so we relax the requirement.

Some datatypes have similar requirements in their bridge
implementations, so we disable those datatypes for local sync.

The patch introduces first browser tests for local sync, which would
have caught such a basic issue.

Bug: 887250
Change-Id: I1bca79478958ac64ee5502e4795f8619ee50e85c
Reviewed-on: https://chromium-review.googlesource.com/1235935
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592792}