[7u6] Review request for 7149062: [macosx] dock menu don't show available frames

[Anthony Petrov]

Hello,

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

Bug: http://bugs.sun.com/view_bug.do?bug_id=7149062

Fix: 
http://cr.openjdk.java.net/~anthony/7u6-9-windowListInDockMenu-7149062.0/

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best regards,
Anthony