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This reverts commit 9771027b.

Reason for revert: Breaks ash_unittests on ASAN bots (use after free)
https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20(1)/39004/overview

Original change's description:
> desks: Fix crash when touchpad swipe with external monitors.
>
> The crash was because a new screenshot is requested when the current
> screenshot is about to get scrolled out of bounds. It was using a fixed
> number threshold, meaning displays that are not the same size could
> get out of sync easily, leading to a CHECK failure.
>
> This CL addresses that by requesting screenshot on all displays if even
> one of them needs one. Another approach would be change the spacing and
> threshold to be based on the display width instead of fixed number, but
> that could be prone to roundoff error which may cause a similar issue.
>
> Also noticed visible desk metric was double counting when there are
> multiple displays. Added a TODO for that one as it is lower priority.
>
> Bug: 1154868
> Test: manual, added regression test
> Change-Id: I48f5ef62d3284b710f44a2808f75c95686bc9b3d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570551
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833993}

TBR=afakhry@chromium.org,sammiequon@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

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

Bug: 1154868
Change-Id: I23cf043d8bc4ae5c9ed8531429b9ffcee43224e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575778Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834100}