ivi-shell: remove content_observer leftover

content_observer_notification is removed by the commit:
193e301c740b582f20307e3e08f8373d26ea968f.

Therefore, this callback function is unused.

Signed-off-by: Emre Ucan <eucan@de.adit-jv.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 file changed