[8u40] Request for approval: 8064468 ownedWindowList access requires synchronization in Window.setAlwaysOnTop() method

[Alexander Scherbatiy]

Hello,

Could you approve the direct backport of the fix to JDK 8u-dev.

The bug: https://bugs.openjdk.java.net/browse/JDK-8064468
The webrev: http://cr.openjdk.java.net/~alexsch/8064468/webrev.00
The review thread: 
http://mail.openjdk.java.net/pipermail/awt-dev/2014-November/008682.html
The JDK 9 changeset: 
http://hg.openjdk.java.net/jdk9/client/jdk/rev/14ea41a9241f

Thanks,
Alexandr.