[spec-reviews] Storage persistence (#85)

Could someone review two methods from the [storage API](https://storage.spec.whatwg.org/) that chrome would like to ship? That is:
`navigator.storage.requestPersistent()`
`navigator.storage.persistentPermission()`

/cc @annevk 

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Reply to this email directly or view it on GitHub:
https://github.com/w3ctag/spec-reviews/issues/85