Asynchronously requests the D-Bus service to delete the key files for this and all of its descendants and broadcast their removal to all clients.
The this must be removable.
When the operation is finished, callback will be called. You can then call remove.end to
get the result of the operation.
| this |
the Source to be removed |
| cancellable |
optional Cancellable object, or |
| callback |
a TaskReadyCallback to call when the request is satisfied |
| user_data |
data to pass to the callback function |