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This reverts commit 6860e109.

Reason for revert: Speculative revert to fix fast/frames/iframe-scaling-with-scroll.html. https://crbug.com/1136335

Original change's description:
> Limit minimum scale of PaintedScrollbarLayer to 1
>
> This is to avoid too low scale when animating scale above the
> scrollbar layer.
>
> This is not ideal. In the future we should move rasterization of
> scrollbar layers to impl-side to better handle scales
> (crbug.com/1009291).
>
> Bug: 1133997
> Change-Id: I3364754f530914816fe8526c627e6cf12e7942ec
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453436
> Reviewed-by: David Bokan <bokan@chromium.org>
> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#814681}

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

Change-Id: I4554c428bcc5a3d5fef9033e6772f53932d0e256
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1133997, 1136335
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459087Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814987}