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This reverts commit 581a728b.

Reason for revert: Causing significant test flakiness in telemetry.internal.actions.scroll_unittest.ScrollActionTest.testScrollDistanceSlowWheel.

Original change's description:
> synthetic gesture: Allow high-frequency dispatch.
> 
> For synthesized scroll/drag/pinch gestures, dispatch the events
> at a high frequency (120Hz) so that there's at least one event in
> each frame. Dispatching events at a lower frequency (60Hz) means
> the timer can go out of sync with begin-frame, and so there can
> be frames where there was to event dispatch. Our telemetry code
> reports this as jank, which is incorrect. Dispatching at a higher
> frequency for the scroll/drag/pinch gestures resolves this issue.
> 
> BUG=783034
> 
> Change-Id: I1102f76ed743231cbb10fdb872e8c66f895fa223
> Reviewed-on: https://chromium-review.googlesource.com/c/1255152
> Reviewed-by: Victor Miura <vmiura@chromium.org>
> Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
> Reviewed-by: Lan Wei <lanwei@chromium.org>
> Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#596507}

TBR=sadrul@chromium.org,vmiura@chromium.org,lanwei@chromium.org,nzolghadr@chromium.org

Change-Id: I1e4d64dfc3b98a547c38f8f82a2dcd45141fd66b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 783034, 892036
Reviewed-on: https://chromium-review.googlesource.com/c/1261972Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596748}