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This reverts commit c3acb7ba.

Reason for revert: This change may be causing ash_unittests to fail on multiple builders - see crbug.com/894683

Original change's description:
> splitscreen: Adjust bubble dialog bounds if splitscreen is active.
> 
> When a dialog is added to a window that's currently showig in
> splitscreen, we should adjust the dialog bounds to show the dialog
> aligned within its own side of the split, rather than across the divider
> bar.
> 
> Note the divider is still placed on top of the snapped windows and its
> transient children if they are placed in default container.
> 
> Bug: 878268
> Change-Id: Ibdd71f1d42aac419ef73ae9f7a2f78af6bf36880
> Reviewed-on: https://chromium-review.googlesource.com/c/1274197
> Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#598827}

TBR=xiyuan@chromium.org,xdai@chromium.org

Change-Id: I74d78ce0184d2028811872ac633da33ede16f296
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 878268, 894683
Reviewed-on: https://chromium-review.googlesource.com/c/1277907Reviewed-by: Patti <patricialor@chromium.org>
Commit-Queue: Patti <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599069}