I ported the the two remaining users of it to use purple_contact_find_dm and
purple_contact_create_dm_async.
Testing Done:
Ran the turtles and tested the notification from the demo protocol plugin.
This is a bit bugged out right now in the demo protocol plugin, as the new code requires that a PurpleContact exists, but the demo protocol plugin isn't creating them for the add user notifications.
Reviewed at https://reviews.imfreedom.org/r/3108/
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