Remove pathspec for this index and call the ReceiveFetchedFile method.

def _ReceiveFetchedFile(self, tracker):
    """Remove pathspec for this index and call the ReceiveFetchedFile method."""
    index = tracker["index"]

    _, request_data = self._RemoveCompletedPathspec(index)

    # Report the request_data for this flow's caller.
    self.ReceiveFetchedFile(
        tracker["stat_entry"], tracker["hash_obj"], request_data=request_data)