code: def delete(self):
          # type: (_BaseResumeManager) -> None
          
          self.close()
          if self._resume_file.exists():  # noqa
              try:
                  self._resume_file.unlink()
              except OSError as e:
                  logger.warning('could not unlink resume db: {}'.format(e))
          for ext in ('.bak', '.dat', '.dir'):  # noqa
              fp = pathlib.Path(str(self._resume_file) + ext)
              if fp.exists():
                  try:
                      fp.unlink()
                  except OSError as e:
                      logger.warning('could not unlink resume db: {}'.format(e))
docs: Delete the resume file db
          :param _BaseResumeManager self: this