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This CL is a follow-up for https://chromium-review.googlesource.com/c/chromium/src/+/1212255.

It looks WebKit also landed the CL: https://trac.webkit.org/changeset/236002/webkit.

fast/dom/shadow/shadow-boundary-events.html is the only existing test which needs the rebase.

BUG=883650

Change-Id: Iecee6777a207b956b1dad6cc842061fd460ec6ab
Reviewed-on: https://chromium-review.googlesource.com/1229741Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592255}