[7u6] Review request for 7174718: [macosx] Regression in 7u6 b12: PopupFactory leaks DefaultFrames.

[Anthony Petrov]

Hello,

Please review a fix for http://bugs.sun.com/view_bug.do?bug_id=7174718 at:

http://cr.openjdk.java.net/~anthony/7u6-14-AWTWindowLeak-7174718.0/

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

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best regards,
Anthony