[w3c/ServiceWorker] Set request's initiator and destination to empty string in cache.addA… (PR #1822)

As pointed out in https://github.com/w3c/ServiceWorker/issues/1718, "fetch" is not a valid value for a request's initiator, and "subresource" is not a valid destination in the Fetch specification.

Following the discussion in the issue, `cache.addAll()` should function the same as if a script ran `fetch()` directly. Therefore, both initiator and destination should be set to the empty string.

Fixes #1718


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  https://github.com/w3c/ServiceWorker/pull/1822

-- Commit Summary --

  * Set request's initiator and destination to empty string in cache.addAll() (#1718)

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1822.patchhttps://github.com/w3c/ServiceWorker/pull/1822.diff
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