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This reverts commit 36458f22.

Reason for revert: This CL leads to data loss.

Original change's description:
> [Locked Fullscreen] Disable ARC while in locked fullscreen
> 
> Locked fullscreen is supposed to be a secure mode where the user cannot do
> anything outside of the current browser window, but ARC apps can currently draw
> on top of it.  To fix this, we disable ARC when entering the mode, and we
> re-enable it upon exiting the mode.
> 
> Bug: 888611
> Change-Id: I84cda87a260a42108f1ef6c4767c174bc8b1fb61
> Reviewed-on: https://chromium-review.googlesource.com/c/1356813
> Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
> Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#613254}

TBR=isandrk@chromium.org,karandeepb@chromium.org

Change-Id: I9e5ca84ba4e186cb43e3a186da9b659b03368145
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 888611
Reviewed-on: https://chromium-review.googlesource.com/c/1359813Reviewed-by: Yury Khmel <khmel@chromium.org>
Commit-Queue: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613356}