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In Nearby Share, we encounter a problem of an image notification not
showing entirely. This happens because of this use case:
- The popup notification A is showing and we hover over that
notification.
- Notification A is then removed automatically to show notification B
with image.
- Notification B with image is cut off because we accidentally enter hot
mode.

This CL added a check so that we only start hot mode when necessary
(when a notification is closed by an actual user).

Fixed: 1154741
Change-Id: I306e66e92d2e28ba11cb1526089789ad1eb9331b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591267
Commit-Queue: Andre Le <leandre@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843219}