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This reverts commit 7f72fc62.

Reason for revert: Caused P0 crbug.com/1155271.

Original change's description:
> Use composited scrolling if resizer needs to be above descendants
>
> A resizer on an element containing composited stacked descendants
> needs to be painted after the descendants. In pre-CompositeAfterPaint
> this can only be achieved by using composited scrolling for the element
> so that we'll composite the resizer even if the element is not
> scrollable.
>
> In CompositeAfterPaint everything is good because we always use the
> correct paint order.
>
> Bug: 1135676
> Change-Id: Ic69b830ae3d71cd9f6b8f55deca591b485b189a5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523748
> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
> Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825613}

TBR=wangxianzhu@chromium.org,chrishtr@chromium.org

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

Bug: 1135676
Change-Id: Ie47558d1e9cbb1ed8f29e21286128899085be338
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583603Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835581}