Re: [sensors] Add mitigation strategy for skimming attacks when focus is lost.

>From the algorithm at https://html.spec.whatwg.org/#currently-focused-area-of-a-top-level-browsing-context it follows that a browsing context always has a _currently focused area_ (did I get it wrong?), 
so "If the [=currently focused area=] is in a different [=top-level browsing context=]" will always be `true`, isn't it?

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