[7u] Approval request for 8007006: [macosx] Closing subwindow loses main window menus

[Leonid Romanov]

Hi,
This is a request to push the fix for 8007006: [macosx] Closing subwindow loses main window menus into 7u-dev. This fix is exactly the same as the fix pushed into the jdk8 repo. It has been reviewed by Anthony Petrov and Sergey Bylokhov. 

Bug:  http://bugs.sun.com/view_bug.do?bug_id=8007006
Webrev: http://cr.openjdk.java.net/~leonidr/8007006/webrev.00/