Type of a mock function for Folks.PersonaStore.remove_persona.
See FolksDummy.PersonaStore.set_remove_persona_mock.
| persona | the persona being removed from the store | 
| delay to apply to the remove persona operation (negative and zero delays complete in an idle callback; positive delays complete after that many milliseconds) | 
| PersonaStoreError | to be thrown from Folks.PersonaStore.remove_persona | 
0.9.7