MB-100 Remove unused function.

Change-Id: I547e233828f4ef59e9bcbce63a8e0153a17fa555
Reviewed-on: http://review.couchbase.org/28367
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>