delete method
The delete() method of the CacheStorage interface finds the
Cache object matching the cacheName, and if found, deletes the Cache
object and returns a Promise that resolves to true.
If no Cache object is found, it resolves to false.
You can access CacheStorage through the Window.caches property in
windows or through the WorkerGlobalScope.caches property in workers.
Implementation
external JSPromise<JSBoolean> delete(String cacheName);