[Deprecation] Application Cache

[Deprecation] Application Cache is deprecated in non-secure contexts, and will be restricted to secure contexts in M69, around September 2018. Please consider migrating your application to HTTPS, and eventually shifting over to Service Workers. See https://goo.gl/rStTGz for more details.
T.applicationcache @ libs.min.js?ver=4.9.8:1

Please advise on when this will be updated… My site is being maliciously attacked due to depreciation in theme files.