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This reverts commit 053d939f.

Reason for revert: Hit testing artifacts.

Original change's description:
> [vr] Ensure that hit testing uses the same stacking order as rendering
>
> The rendering code was updated to sort elements in tree rather than
> depth order in this cl:
> https://chromium-review.googlesource.com/c/chromium/src/+/727342
>
> The hit testing code, however, was not similarly updated. Consequently,
> there can be discrepancies. This CL updates the hit testing code to
> use nearly the same stacking order as rendering. Note: it is not quite
> perfect because the ui renderer still summons swaths of elements from
> the scene explicitly. Eventually, the ui renderer will simply sort
> and render all elements in the tree and these will be truly identical.
> However, until then, this ensures we do use the same element sorting
> routines.
>
> Bug: None
> Change-Id: I12483713f19b678aa9a69b91e5d910e408b73007
> Reviewed-on: https://chromium-review.googlesource.com/754554
> Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
> Commit-Queue: Ian Vollick <vollick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#514136}

TBR=vollick@chromium.org,mthiesse@chromium.org,cjgrant@chromium.org

Change-Id: I920d8ffcb2dc7aad53ed021d272302cad060f083
Reviewed-on: https://chromium-review.googlesource.com/763007
Commit-Queue: Ian Vollick <vollick@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515465}