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This reverts commit fef9e5a5.

Reason for revert: Speculative revert for crbug.com/1000686

Original change's description:
> Experiment with sending click as PointerEvent
> 
> This CL adds a runtime flag that sends the
> click and auxclick events as PointerEvents.
> 
> There are more cases to fix such as context menu
> events and click from other paths such as
> touch and pointerlock.
> 
> Bug: 989958
> Change-Id: I0e440ceef29e6cad202bc7f07150c7f3b6b35da0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762792
> Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
> Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
> Reviewed-by: Ella Ge <eirage@chromium.org>
> Commit-Queue: Navid Zolghadr <nzolghadr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#693152}

TBR=dtapuska@chromium.org,mustaq@chromium.org,nzolghadr@chromium.org,eirage@chromium.org

Change-Id: Id81618db899ea3dd004d2b5ca882fac31c209e1d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 989958, 1000686
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784839Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693200}