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The package installer has a special event handling when
the user tries to interact with it and an overlay window
intersects the installer one. We show a warning that an
overlay was detected and point the user to settings. This
regressed and nothing happened when the users click the
allow button.

bug:28572707
bug:26677796

Change-Id: I617595e7cd5277576ccb9915946b77082a1c2b9e
(cherry picked from commit 92d61dd6)