Revert "VR: Ensure we remove black overlay if VR is exited while entering."

This reverts commit 9f8158c12189567f8b9f4bcb44dd3cfc68ecd470.

Reason for revert: Culprit of failed VR tests https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Nougat%20Phone%20Tester/6884

Original change's description:
> VR: Ensure we remove black overlay if VR is exited while entering.
> 
> This fixes a failure mode where we shutdownVR after handling the VR NFC
> broadcast, and fail to properly cancel VR entry.
> 
> Also does some other random cleanup of comments/visibility.
> 
> Bug: 862829
> Change-Id: Ic382692d7255aa5893391a602a6c949b4b4d498b
> Reviewed-on: https://chromium-review.googlesource.com/1138726
> Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
> Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#575388}

TBR=mthiesse@chromium.org,tiborg@chromium.org

Change-Id: Ibe67ee8c09dc44ac34d40c3eaf890884b400fc24
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 862829
Reviewed-on: https://chromium-review.googlesource.com/1140813
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575725}
7 files changed