Revert of arc: Fix crash on Arc window close.

Revert of arc: Fix crash on Arc window close. (patchset #1 id:1 of https://codereview.chromium.org/2252283002/ )

Reason for revert:
Wrong resolve

Original issue's description:
> arc: Fix crash on Arc window close.
> 
> BUG=638261
> BUG=b/30817552
> TEST=Manually on device. No more crashes are observed.
> 
> NOTRY=true
> NOPRESUBMIT=true 
> TBR=reviewer@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2251493002
> Cr-Commit-Position: refs/heads/master@{#412390}
> (cherry picked from commit 323b4a4792b0c6eb7e51d2aee66773378229e486)

TBR=
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=638261

[khmel, 2016-08-18 01:46:59]

The CQ bit was checked by khmel@chromium.org

[khmel, 2016-08-18 01:47:00]

Created Revert of arc: Fix crash on Arc window close.

[commit-bot: I haz the power, 2016-08-18 01:47:31]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-18 01:53:02]

Committed patchset #1 (id:1)