CHttpJob: Shutting down the job should actually destroy the socket
It's pretty confusing when a CObject is owned both by its parent-child
relationship, but also by an ObjectPtr member in the parent.
In those cases, we have to make sure we both unparent the child *and*
reove it from the ObjectPtr.
This will become a bit less confusing when ObjectPtr becomes RefPtr,
although still not crystal clear. I'm not sure what the solution is.