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This happens when entering overview normal, then exit via swiping up
swipe up on shelf. So we have to update the rounded corners on the
normal window, even when a window is minimized.

Test: manual
Bug: 989149
Change-Id: I85791484fba9ea165e554c09b6d89a893ce5e2b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1727689Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683441}