Revert of Finish eliminating PlatformWindowMus

Revert of Finish eliminating PlatformWindowMus (patchset #7 id:120001 of https://codereview.chromium.org/1999083002/ )

Reason for revert:
This breaks window-frames in mash

Original issue's description:
> Finish eliminating PlatformWindowMus
>
> R=sadrul@chromium.org
> BUG=609555
>
> Committed: https://crrev.com/2b2114f0e297428fbe15ef169d05f9bbf9749a8e
> Cr-Commit-Position: refs/heads/master@{#395694}

TBR=nyquist@chromium.org,sky@chromium.org,markdittmer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=609555
Committed: https://crrev.com/70394d0c09c10d2ca3f8f82fa9a83bc84478ed6f
Cr-Commit-Position: refs/heads/master@{#395779}

[sadrul, 2016-05-25 02:12:06]

Created Revert of Finish eliminating PlatformWindowMus

[commit-bot: I haz the power, 2016-05-25 02:12:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2013713002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2013713002/1

[commit-bot: I haz the power, 2016-05-25 02:13:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-25 02:15:06]

Description was changed from

==========
Revert of Finish eliminating PlatformWindowMus (patchset #7 id:120001 of
https://codereview.chromium.org/1999083002/ )

Reason for revert:
This breaks window-frames in mash

Original issue's description:
> Finish eliminating PlatformWindowMus
> 
> R=sadrul@chromium.org
> BUG=609555
> 
> Committed: https://crrev.com/2b2114f0e297428fbe15ef169d05f9bbf9749a8e
> Cr-Commit-Position: refs/heads/master@{#395694}

TBR=nyquist@chromium.org,sky@chromium.org,markdittmer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=609555
==========

to

==========
Revert of Finish eliminating PlatformWindowMus (patchset #7 id:120001 of
https://codereview.chromium.org/1999083002/ )

Reason for revert:
This breaks window-frames in mash

Original issue's description:
> Finish eliminating PlatformWindowMus
>
> R=sadrul@chromium.org
> BUG=609555
>
> Committed: https://crrev.com/2b2114f0e297428fbe15ef169d05f9bbf9749a8e
> Cr-Commit-Position: refs/heads/master@{#395694}

TBR=nyquist@chromium.org,sky@chromium.org,markdittmer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=609555

Committed: https://crrev.com/70394d0c09c10d2ca3f8f82fa9a83bc84478ed6f
Cr-Commit-Position: refs/heads/master@{#395779}
==========

[commit-bot: I haz the power, 2016-05-25 02:15:07]

Patchset 1 (id:??) landed as
https://crrev.com/70394d0c09c10d2ca3f8f82fa9a83bc84478ed6f
Cr-Commit-Position: refs/heads/master@{#395779}