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This reverts commit 3088046f.

Reason for revert: Suspected as causing a ProxyCommit regression.

Original change's description:
> Skip commits for painted scrollbar thumb movement
> 
> Painted scrollbars are used for overlay scrollbars on MacOS. Thumb
> movement would cause a commit on every scroll change because the update
> rect (set via Layer::SetNeedsDisplay) would change. This patch ignores
> the update rect in PaintedScrollbarLayer::Update and uses part
> invalidation for causing commits. With this change, scroll offset
> changes do not cause commits.
> 
> Bug: 1048384f
> Change-Id: I79bac7fbd9756cb71af7c3b83be3df824dd7a5cf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078847
> Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
> Commit-Queue: Philip Rogers <pdr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745544}

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

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

Bug: 1048384f, 1059436
Change-Id: I7e6e36fca7afecae35d969ca655965984a90e891
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2092185Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747976}