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Sibling invalidation sets may be (re-)scheduled on shadow roots on dom
changes. If the removed node was the one that needed style invalidation,
we may end up with a style-dirty shadow root with no style-dirty
children. There is a DCHECK in RecalcDescendantStyles which triggers if
we call it unnecessarily. We called it unconditionally in ShadowRoot.

Discovered while minimizing the fuzzer case for the mentioned Bug.

Bug: 798918
Change-Id: I4f59b1a77af6a89ed304abd88d7f8cca84775127
Reviewed-on: https://chromium-review.googlesource.com/850395Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526995}