Revert of ui::PlatformWindowDelegate::OnClosed() isn't called when a ui::X11Window is closed

Revert of ui::PlatformWindowDelegate::OnClosed() isn't called when a ui::X11Window is closed (patchset #1 id:1 of https://codereview.chromium.org/644443002/)

Reason for revert:
Only cl that seems related to http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%281%29/builds/6561 falures.

Original issue's description:
> ui::PlatformWindowDelegate::OnClosed() isn't called when a ui::X11Window is closed
>
> This problem manifests itself in simple Mojo apps that use NativeViewportService on X11. When the NativeViewport window is closed, the NativeViewportClient OnDestroyed() method does not run.
>
> BUG=421536
>
> Committed: https://crrev.com/b37606e1c2a6703e58a61a978e8e32be72acae0c
> Cr-Commit-Position: refs/heads/master@{#298926}

TBR=ben@chromium.org,hansmuller@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=421536
Committed: https://crrev.com/b93c31988a55a9cb2a328e39520f56788585b542
Cr-Commit-Position: refs/heads/master@{#298985}

[jwd, 2014-10-09 21:37:54]

Created Revert of ui::PlatformWindowDelegate::OnClosed() isn't called when a
ui::X11Window is closed

[commit-bot: I haz the power, 2014-10-09 21:38:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/647573002/1

[commit-bot: I haz the power, 2014-10-09 21:40:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-09 21:41:21]

Patchset 1 (id:??) landed as
https://crrev.com/b93c31988a55a9cb2a328e39520f56788585b542
Cr-Commit-Position: refs/heads/master@{#298985}

[brettw, 2014-10-09 22:37:52]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/642953003/ by brettw@chromium.org.

The reason for reverting is: This was not the cause of the regression. See
http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Te....