[whatwg/fetch] Add "only-if-cached" cache mode back (#295)

Fixes #159. The difference with the previous attempt is that it now has
a “same-origin” mode restriction (enforced through the Fetch API).
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/295

-- Commit Summary --

  * Add "only-if-cached" cache mode back

-- File Changes --

    M Overview.html (45)
    M Overview.src.html (45)

-- Patch Links --

https://github.com/whatwg/fetch/pull/295.patch
https://github.com/whatwg/fetch/pull/295.diff

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