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Jun Mukai authored
I've just noticed that crrev.com/606339 causes a crash, and that's because PrintWindowHierarchy starts from a root window, which do not have a parent, but it tries to call IsToplevelWindow() which assumes the existence of the parent. BUG=none TEST=manually Change-Id: Ie4460302674d057a6c7960e0b012c80b63e06a2c Reviewed-on: https://chromium-review.googlesource.com/c/1327560Reviewed-by:
Mitsuru Oshima <oshima@chromium.org> Commit-Queue: Jun Mukai <mukai@chromium.org> Cr-Commit-Position: refs/heads/master@{#606651}
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