[whatwg/fetch] There's no reason to make fetch of about:blank same-origin for loads other than navigations and `<object>` (#384)

I don't think it's required for web compat.  Gecko only does this for navigations and `<object>` (things that can end up with a browsing context).  Specifically, about:blank stylesheets are cross-origin in Gecko, and you can't XHR to about:blank in either Gecko or Blink (bug can in WebKit, apparently).

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