The AdminSearchResultFormat for CustomFields used can()

Since our ::Records are made of AUTOLOAD, can() fails until someone
calls ->Name on a Queue.  /Admin/CustomFields/ would show Applied #3
sometimes for a Queue until every rt-server process had called
$queue->Name.

RT has had a way to work around this forever, and now that 4.0-trunk
actually calls all _BuildAccessible on all our classes, we should just
use _Accessible.
Merge branch '4.0/queue-names-in-customfield-listing' into 4.0-trunk