Remove unneeded includes.

Change-Id: Ic9b7eaa0c4e0210d6b82a9f5fdd4ec3979a4a48e
Reviewed-on: http://review.couchbase.org/36602
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>