Chrome Version:67.0.3376.0/10505.0.0 dev channel Daisy,Candy,Reks
OS:Chrome OS

What steps will reproduce the problem?
(1)Sign into user >> Take a sample screen shot
(2)Click on Notifications icon and Observe

Actual: Screenshot popup stays in maximize form only
Expected:Screenshot should get minimize

This is a Regression issue as same is working fine in 67.0.3375.0/10501.0.0 dev channel

Note: Issue is not seen in Linux,Windows OS

Attached the screenshots for reference..

@yoshiki : Please confirm the behavior
 

Deleted: Actual.mp4 3.8 MB

	Actual.mp4 3.8 MB View Download

Deleted: Expected.mp4 4.8 MB

	Expected.mp4 4.8 MB View Download