Removes contact with uid from the this.
The call is finished by remove_contact_by_uid.end from the callback.
| this |
an BookClient |
| uid |
a UID of a contact to remove |
| opflags |
bit-or of BookOperationFlags |
| cancellable |
a Cancellable; can be null |
| callback |
callback to call when a result is ready |
| user_data |
user data for the |