Re: [w3c/webcomponents] shadow tree -> iframe <- contentWindow.frameElement encapsulation issue (#507)

If you think this way:
`"bar.html"` is given from outside the shadow tree, but it can peek inside closed shadow tree - therefore it breaks encapsulation

Then it's wrong.  What breaks the encapsulation is that you pull the `src` parameter from shadow host and put it in the closed shadow tree in the first place.

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