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This reverts commit 7c25668c.

Reason for revert:

Caused test error for https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/20645

Original change's description:
> Reland "Rewrite scroll interruption tests into browser tests"
>
> After we finish the scroll unification, the scrolls happens mainly on
> the compositor thread, and the scroll code in the main thread will be
> removed. eventSender sends the scroll events to main thread, so it
> would not work after the scroll unification. We rewrite below tests
> fast/scroll-behavior/main-frame-interrupted-scroll.html,
> fast/scroll-behavior/overflow-interrupted-scroll.html and
> fast/scroll-behavior/subframe-interrupted-scroll.html into browser tests
> because we cannot guarantee that the scroll arrives before the animation
> completes.
>
> TBR=bokan@chromium.org
>
> Bug: 1047176
> Change-Id: I59bb34a98326892380d748a2a4691ea4664cad26
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438652
> Reviewed-by: Lan Wei <lanwei@chromium.org>
> Commit-Queue: Lan Wei <lanwei@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#811936}

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

Change-Id: If1db54aa0562084ed90124f9b5e4597e37647378
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1047176
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441293Reviewed-by: Jian Li <jianli@chromium.org>
Commit-Queue: Jian Li <jianli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812270}