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Currently if a user moves a window to another display via overview, its
header is invisible upon exiting overview.

This CL resets the clipping created when the overview item is created
to prevent this bug.

Test: manual
Fixed: 1140639
Change-Id: I9e5d943bcb4ac7e8fb2054775c2695b2516dc381
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533553
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826865}