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This reverts commit bad70cb2.

Reason for revert: SyntheticInputTest.SlowSmoothScrollWheel is
still flaky on Android. https://crbug.com/1086450

Original change's description:
> [synthesized scroll] Fix wheel-event precision on android.
> 
> Update API to set fractional wheel deltas on android, and remove the
> code that explicitly used to remove precision.
> 
> BUG=1085890
> 
> Change-Id: Ifd18df07637b2fa28288de62bf538f65f7a4d0a7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213406
> Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
> Reviewed-by: David Bokan <bokan@chromium.org>
> Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#771639}

TBR=sadrul@chromium.org,yfriedman@chromium.org,bokan@chromium.org,nzolghadr@chromium.org

Change-Id: Ib671a1db643144448de054fc93b43a2ad87e4805
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1085890, 1086450
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215824Reviewed-by: Alex Ilin <alexilin@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771760}