Re: [w3c/ServiceWorker] "no-cors" CSS SOP violation (#719)

1. Add "css" (and "worker" if required) in [request initiator](https://fetch.spec.whatwg.org/#concept-request-initiator).
2. Add opaque-subresource request (near [subresource request](https://fetch.spec.whatwg.org/#subresource-request)).
>A opaque-subresource request is a request whose initiator was fetched with [request mode](https://fetch.spec.whatwg.org/#concept-request-mode) "no-cors" and response was cross-origin (should be replaced with better sentence).
3. Add following step between step 10 and step 11 of [handle fetch](https://w3c.github.io/ServiceWorker/#handle-fetch)
> If request is a opaque-subresource request, then: Return null.

This should do. Let's fix this.

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