Holden Barina 2006: ABS unnecessary?

OVER the last month or so the ABS warning light on my 2006 Holden Barina has been illuminated. I've had it checked by a mechanic who told me not to worry about it as the brakes on the car were in perfect order and the ABS system was not really necessary. His advice was to disconnect the ABS altogether, which I'd rather not do. I'm trying to avoid going to a Holden dealer, as this could prove rather costly. Would an ordinary mechanic be able to fix this problem?