Revert of [M55] Generalize layer mirroring for phantom windows

Revert of [M55] Generalize layer mirroring for phantom windows (patchset #1 id:1 of https://codereview.chromium.org/2459653003/ )

Reason for revert:
This broke Windows build: https://bugs.chromium.org/p/chromium/issues/detail?id=660183

Original issue's description:
> [M55] Generalize layer mirroring for phantom windows
> 
> Previously, the layers of a phantom window were recreated when the
> surface changed in the corresponding layers of the original window.
> The code also assumed that layers with surfaces are leaves in the
> layer tree, but Exosphere surfaces are nested. Recursive layer
> cloning would be inefficient for surfaces changing in each frame,
> so this CL adds an alternative way to mirror layers. In addition,
> the bounds of Exosphere surfaces relative to their parent window
> are updated whenever the window moves, so this CL provides a way
> to synchronize relative positions of layers in phantom windows.
> 
> In addition to implementing phantom windows for ARC apps, this CL
> fixes three bugs related to mirroring:
> 
>   1) Memory corruption due to the non-recursive layer cloning.
>   2) Dangling pointers due to observers sticking around.
>   3) Black Alt+Tab previews for ARC windows.
> 
> R=lhchavez@chromium.org
> TBR=danakj@chromium.org, oshima@chromium.org, reveman@chromium.org, sadrul@chromium.org, sky@chromium.org
> BUG=642894
> BUG=649452
> BUG=653113
> TEST=ARC apps that render continuously (e.g. games, video players)
>      can be dragged to external displays, and their content is
>      mirrored in phantom windows.
> TEST=ARC apps are mirrored in Alt+Tab previews.
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
> 
> Review-Url: https://codereview.chromium.org/2383263002
> Cr-Commit-Position: refs/heads/master@{#427891}
> (cherry picked from commit 4b33bfeda856f7ae20ffa43176e5bd529d5a100a)
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/497b50fc19904a059de566474ff099519a4c881a

TBR=danakj@chromium.org,oshima@chromium.org,reveman@chromium.org,sadrul@chromium.org,sky@chromium.org,domlaskowski@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=642894

[Luis Héctor Chávez, 2016-10-27 21:51:17]

The CQ bit was checked by lhchavez@chromium.org

[Luis Héctor Chávez, 2016-10-27 21:51:17]

Created Revert of [M55] Generalize layer mirroring for phantom windows

[commit-bot: I haz the power, 2016-10-27 21:52:03]

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, 2016-10-27 21:55:30]

Committed patchset #1 (id:1)