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This reverts commit a9fdf9b7.

Reason for revert: due to null reference. I'll revert and land new one with fix to make merge easier.

Original change's description:
> Overview optimizations
> 
> * Pause occusion tracker during overview animation
> * Activate the text filter after animation
> * Don't animate backdrop window during overview animation.
> * Fix the bounds change issue in WindowGrid. It shouldn't change
> the parent window's bounds.
> 
>   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.
> 
> Bug: 898077, 897387
> Test: no functional change. Manually tested visual change by entering/exiting overview mode
> Change-Id: I60c2709c5394a565bae6d0c4bfdd7006e2e76496
> Reviewed-on: https://chromium-review.googlesource.com/c/1304973
> Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Sammie Quon <sammiequon@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#604206}

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

Change-Id: Ied4ce4d12abc962bffead6e22bbd7e2a837ad544
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 898077, 897387
Reviewed-on: https://chromium-review.googlesource.com/c/1311793
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604430}