Remove unneeded require
Remove unneeded require

superclass_delegating_accessor is not being used in the codebase
anymore.

razorpay/offsite_payments,javiacei/offsite_payments,activemerchant/offsite_payments,weak4/offsite_payments,sealink/offsite_payments,Mohit-Aggarwal1/offsite_payments,Mohit-Aggarwal1/offsite_payments,Shopify/offsite_payments,pierre/offsite_payments,razorpay/offsite_payments,saifiikmal/offsite_payments,activemerchant/offsite_payments,saifiikmal/offsite_payments,axvm/offsite_payments