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This reverts commit 2ca01526.

Reason for revert: Speculative revert for https://crbug.com/978980

Original change's description:
> Do not coalesce wheel with phaseBegan to wheel with phaseEnded.
>
> If no element in the scrolling chain is not scrollable in the given direction
> (delta_hints) on GSB we latch to the viewport. This is not user friendly on
> platforms that do not have any scroll affordance animations (e.g. Windows)
> since if the user changes the scrolling direction and an element in the chain
> is actually scrollable in the new direction, the user expects it to scroll and
> has no idea that we have latched to the (possibly unscrollable) viewport for
> the rest of the scroll sequence. To address the issue for timer based wheel
> scroll sequence we end the sequence and start a new one upon arrival of a wheel
> event with different delta directions if no GSU has been consumed since the
> beginning of the sequence. This cl ensures that the GSE/GSB generated for
> breaking the latching seqeunce are not coalesced with each other.
>
> Bug: 882998
> Change-Id: Icf703c935475fffd69b899c59abc03ec1b548784
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1524703
> Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
> Commit-Queue: Sahel Sharify <sahel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#641719}

TBR=nzolghadr@chromium.org,sahel@chromium.org

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

Bug: 882998,978980
Change-Id: I85799b6e6eace029b4c2ef00e142f035ac9e8e4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1688230Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#674615}