Remove obselete spec.
Remove obselete spec.

The worker class is no longer concerned with retryable exceptions.
custora/qless,backupify/qless,backupify/qless,Shopify/qless,seomoz/qless,backupify/qless,custora/qless,Shopify/qless,custora/qless,Shopify/qless,seomoz/qless,seomoz/qless,backupify/qless,seomoz/qless,Shopify/qless,custora/qless