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This reverts commit c3f6c6c0.

Reason for revert: Causes regressions in the below linked bugs.

Original change's description:
> overview: Fade the crostini window back in if it fails to close.
> 
> The crostini installer (and other non-closeable) windows will reverse
> their animations in overview if the CloseWidget call fails to close
> the window.
> 
> Test: manual
> Bug: 970196
> Change-Id: I7aeab07c9d7f2f5e94a34ac8b3a43bdde3610b6f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121346
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#753660}

TBR=xdai@chromium.org,sammiequon@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Id0a29e92c3711a79771a22a59a8301a1fa5a43f1
Fixed: 1066167, 1066169
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128230Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754631}