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The semantics of document.activeElement and someElement.shadowRoot.activeElement
seem to have changed between Shadow DOM v0 and v1.

In V1 the following is possible:
someElement.shadowRoot.activeElement is null AND document.activeElement points to a child
belonging to |someElement|.

which does not seem to be the case for Shadow DOM v0.

Always recursing from document.activeElement seems more robust and works for both cases.

Bug: 875470
Change-Id: I53044c23bcfcfa85264b5154e635e44c05ce0f6f
Reviewed-on: https://chromium-review.googlesource.com/1208454Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589049}