overlay.clear: read closed shadow roots and remove the host element

Diagnostics on 1Password's inline prompt: the page holds a <com-1password-uso>
element and no iframe in its own DOM; the frame is inside a closed shadow root.
Run in the isolated world, where chrome.dom.openOrClosedShadowRoot can read it,
and remove the element that hosts a foreign extension frame. Drop the body-click
events: they were never shown to help.

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