<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def delete_user_role(self, user, role):
 """ Remove role from given user. Args: user (string):
 User name. role (string):
 Role to remove. Raises: requests.HTTPError on failure. """

        self.project_service.set_auth(self._token_project)
        self.project_service.delete_user_role(user, role)