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This reverts commit 536b412d.

Reason for revert: the test is failing on Linux Chromium OS ASan LSan Tests, crbug.com/1149939

Original change's description:
> desks: Speculative fix for crash.
>
> The previous attempt [1] added checks for whether the starting or ending
> screenshot was taken. In the case of the starting screenshot missing, it
> would signal the animation to remove some RootWindowDeskSwitchAnimators,
> leading to a vector out of bounds.
>
> [1] https://chromium-review.googlesource.com/c/chromium/src/+/2506356
>
> Bug: 1148607
> Test: added regression test
> Change-Id: I7f14df877cb93619a0ca8a85f5d0ad434dda3ad2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536934
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#828034}

TBR=afakhry@chromium.org,sammiequon@chromium.org

Change-Id: I27cc6811a5edd38a56eb82f20752638351e2b2df
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1148607
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544443Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828204}