[whatwg/fetch] Some browsers are reusing 'no-cache' cached images without revalidation (#1088)

As discussed in https://bugs.webkit.org/show_bug.cgi?id=216048, it seems Chrome and Firefox are not always obeying 'Cache-Control: no-cache' directives, at least for image loads with directives like 'Cache-Control: public, max-age=31536000, no-cache'.
WebKit is currently revalidating such image loads which has a perf impact.
If both Chrome and Firefox are actually skipping revalidation in some cases, it might be worth documenting that in the fetch spec.

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