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This reverts commit e186dbf7.

Reason for revert: Introduced flakyness in virtual/user-activation-v2/fast/events/middleClickAutoscroll-drag.html.

See https://crbug.com/891155

Original change's description:
> Convert middleClickAutoscroll.js to use gpu benchmarking
> 
> This cl converts middleClickAutoscroll.js and the middle click autoscroll
> layout tests that are using it to use gpu benchmarking.
> 
> Bug: 875945
> Change-Id: Ic5acb4367dd406de3e5897063bfe6b1b44e7daa6
> Reviewed-on: https://chromium-review.googlesource.com/1251901
> Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
> Commit-Queue: Sahel Sharify <sahel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#595596}

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

Change-Id: I108620182b4466997df7734f01718e102628fcf6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 875945
Reviewed-on: https://chromium-review.googlesource.com/1256923Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595818}