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This reverts commit e3d54350.

Reason for revert: Broke detached bookmark bar

Original change's description:
> Implement |GetChildrenInZOrder| in browser and top container views
> 
> Currently, we ensure that the bookmark bar view is always the first
> child view of its parent to ensure that toolbar inkdrops are drawn on
> top of it. Unfortunately, this breaks keyboard traversal order.
> 
> This change implements |GetChildrenInZOrder| on the two views that
> host the bookmark bar: browser view and top container view. This
> ensures that the bookmark bar is painted first, removing the need
> to manipulate child view order.
> 
> Bug: 712347
> Change-Id: If8f2aabe816a86b7ec29ff41779783c0f05a6393
> Reviewed-on: https://chromium-review.googlesource.com/1052854
> Commit-Queue: Leonard Grey <lgrey@chromium.org>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#557537}

TBR=ellyjones@chromium.org,lgrey@chromium.org

Change-Id: I43286f3f1a771a8835f72d28c2333f67c9ef6b7b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 712347
Reviewed-on: https://chromium-review.googlesource.com/1054594Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557857}