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Tapping anywhere else on the app (e.g. the keyWindow) will make the
popover disappear.

Bug: 1149618
Change-Id: If7f712cd3498b0a055a364d047105464d58492d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2542366
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827975}