[7u6] Review request for 7159266: [macosx] ApplicationDelegate should not be set in the headless mode

[Anthony Petrov]

Hello,

Please review a fix for 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7159266 at:

http://cr.openjdk.java.net/~anthony/7u6-4-fxHang-7159266.0/

With this fix we avoid setting an application delegate when AWT is 
started in the headless mode. This prevents a hang when another GUI 
toolkit (e.g. JavaFX) is already running in the same Java process.

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best regards,
Anthony