Re: [whatwg/fetch] consider allowing `only-if-cached` with mode `navigate` (#1237)

In chromium we have a [bug](https://bugs.chromium.org/p/chromium/issues/detail?id=1098389) about devtools triggering requests with `only-if-cached` which are then intercepted by service workers.  In some site service worker scripts that do something like `new Request(evt.request)` this blows up because of step 21 here:

https://fetch.spec.whatwg.org/#dom-request

In this case mode is `navigate` instead of `same-origin`.  Requests with mode `navigate`, however, must be same-origin to the current context.  Could we relax this check to allow `only-if-cached` if the mode is `same-origin` or `navigate`?

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