Revert "tablet: Fix edge case with |defer_bounds_updates| set inappropriately."

This reverts commit ceeb0d16728a39fa3bb8e093543c8406927809da.

Reason for revert: Oshima's video shows that this CL did not resolve the problem.

Original change's description:
> tablet: Fix edge case with |defer_bounds_updates| set inappropriately.
> 
> This CL is meant as a low-risk fix of Issue 926602 to merge back to M73.
> For the long term, it will be preferable to avoid maximizing windows
> before snapping them. Then we might even be able to eliminate
> |defer_bounds_updates| altogether (even though it existed before
> anything about snapped windows carrying over from desktop to tablet).
> 
>   TabletModeControllerTest.DeferBoundsUpdatesForWindowsInOverview*
> 
> Test: ash_unittests TabletModeControllerTest.StartTablet*
> Test: ash_unittests
> Bug: 926602
> Change-Id: I55f4cc28b558ab50b2d4a5be1a19ee7b5de8b00f
> Reviewed-on: https://chromium-review.googlesource.com/c/1457235
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
> Commit-Queue: Avery Musbach <amusbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#631462}

TBR=oshima@chromium.org,xdai@chromium.org,amusbach@chromium.org

Change-Id: I56426782c58119c91d467adff25777e7563082d9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 926602
Reviewed-on: https://chromium-review.googlesource.com/c/1470832
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631809}
6 files changed