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[iOS] Remove use of BVC's _model ivar.

This CL makes BVC's tabModel property synthesized, and changes all uses
of the previous backing ivar to uses of the property.

Change-Id: If75a5b72e0fd222d08a0aa8b7c493d07e404b24f
Reviewed-on: https://chromium-review.googlesource.com/c/1323556
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606464}