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This reverts commit 46a9bbb1.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Overview optimizations
> 
> This is 2nd attempt to land: crrev.com/c/1304973
> [2] are the difference from above CL.
> 
> *[2] Added null check in OnStartingAnimationComplete.
> * Pause occusion tracker during overview animation
>  [2] wait 5000ms when exiting overview before resume
>        because a user may re-enter overview
>  [2] wait 50ms when entering overview before resume
>        because it can take 2 frame to finish draing the frame
>        after animation observer is called.
> * Activate the text filter after animation
> * [2]Animate shelf after overview animation.
> * [2] Improve blur animation:
>  Use Compositor's AnimationObesrver to drive animation
>  Progress only by 2 to reduce the frequency.
> * Don't animate backdrop window during overview animation.
> * Fix the bounds change issue in WindowGrid. It shouldn't change
> the parent window's bounds.
> 
> 
> Bug: 898077, 897387, b/118675936
> Test: no functional change. Manually tested visual change by entering/exiting overview mode
>   in both clamshell and tabletmode.
>   The web contents should load after animations without backdrop animation.
>   No gap at the bottom of the screen after exiting overview mode.
> 
> Change-Id: I5e5dc17afd62d4dc477d87becdeee91c55bd81ca
> Reviewed-on: https://chromium-review.googlesource.com/c/1304973
> Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> Cr-Original-Commit-Position: refs/heads/master@{#604206}
> Reviewed-on: https://chromium-review.googlesource.com/c/1312614
> Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#604844}

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

Change-Id: Ia07f696386ce2889a1d6344218be355a3515975c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 898077, 897387, b/118675936
Reviewed-on: https://chromium-review.googlesource.com/c/1316169Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605052}