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This reverts commit 46da36e1.

Reason for revert: Still breaking 
HomeToOverviewNudgeControllerTest.NudgeHiddenDuringShowAnimation

Original change's description:
> wm: Reland improve cross fade animation.
> 
> Reland crrev.com/c/2224990, including a fix for failing builders and
> a fix with tablet screenshot related.
> 
> Speculative fix crrev.com/c/2218557 was not enough. I was able to repro
> locally and confirm this fix this time. It seems with certain build args
> we can get into a state where the CrossFadeObserver which observes window
> can be not animating, which is strange as the observer observes window
> and deletes itself on animation end.
> 
> It seems in that test and bot, it can happen perhaps OnWindowDestroying
> is called before the window starts animating, or some other edge case.
> In this case, make sure the window is deleted if not animating.
> 
> Test: none
> Bug: 1088169, 1088039
> Change-Id: Ibe035209e83400921f16cff2bb272a8e186934dc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224023
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#777446}

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

Change-Id: Ib273d1ba96dc26a68cd765917f649230a2bbc0d0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1088169, 1088039
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2242218Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#777522}