Remove duplicate id.

Change-Id: I66c8105f3ac373e979f6927e373c6a1bfce31087
Reviewed-on: http://review.couchbase.org/34216
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>