def delete_face(face_list_id, persisted_face_id, custom_headers:nil)
      response = delete_face_async(face_list_id, persisted_face_id, custom_headers:custom_headers).value!
      nil
    end
def delete_face(face_list_id, persisted_face_id, custom_headers:nil)
      response = delete_face_async(face_list_id, persisted_face_id, custom_headers:custom_headers).value!
      nil
    end
Delete an existing face from a face list (given by a persistedFaceId and a
 faceListId). Persisted image related to the face will also be deleted.

 @param face_list_id [String] Id referencing a particular face list.
 @param persisted_face_id Id referencing a particular persistedFaceId of an
 existing face.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.