Remove reference to URL object - a missed bit in CacheList interface
Remove reference to URL object - a missed bit in CacheList interface

mkruisselbrink/ServiceWorker,karolklp/ServiceWorker,martinthomson/ServiceWorker,karolklp/ServiceWorker,martinthomson/ServiceWorker,chadoliver/ServiceWorker,chadoliver/ServiceWorker,justinleoye/ServiceWorker,justinleoye/ServiceWorker,chadoliver/ServiceWorker,slightlyoff/ServiceWorker,justinleoye/ServiceWorker,mkruisselbrink/ServiceWorker,slightlyoff/ServiceWorker,zuzusik/ServiceWorker,zuzusik/ServiceWorker,martinthomson/ServiceWorker,zuzusik/ServiceWorker,karolklp/ServiceWorker