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This reverts commit f93b22c3.

Reason for revert: It causes crashes. Please see crbug.com/1160507
Bug: 1160507

Original change's description:
> Set window properties when creating widget, not after.
>
> Optimize ArcOverlayManager so that it observe arc windows only.
>
> Bug: None
>
> Change-Id: Ic6c5f43fea647369eac092c1c4c4d68aed7d8ce9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578377
> Commit-Queue: Mitsuru Oshima (slow: gardener) <oshima@chromium.org>
> Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#838281}

TBR=oshima@chromium.org,lpique@chromium.org,yhanada@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

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

Bug: None
Change-Id: I11338ea9ab9fd72aa3d0b0a14b0b47a51edb1425
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600417Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838772}