[7u6] Request for approval for CR 7174718: [macosx] Regression in 7u6 b12: PopupFactory leaks DefaultFrames.

[Anthony Petrov]

Bug: http://bugs.sun.com/view_bug.do?bug_id=7174718
Webrev: http://cr.openjdk.java.net/~anthony/7u6-14-AWTWindowLeak-7174718.0/
Review thread: 
http://mail.openjdk.java.net/pipermail/macosx-port-dev/2012-June/004510.html
Reviewers: Artem Ananiev, Sergey Bylokhov

Note: this is a 100% direct back-port of the same fix from JDK 8.

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best regards,
Anthony