<AWT Dev> [9] Review Request: 8048549 [macosx] Disable usage of system menu bar if AWT is embedded in FX

[Petr Pchelko]

Hello, AWT Team.

Please review the fix for the issue:
https://bugs.openjdk.java.net/browse/JDK-8048549
The fix is available at:
http://cr.openjdk.java.net/~pchelko/9/8048549/webrev/

We need to disable the screenMenuBar if AWT is embedded into FX. Only the top-level UI toolkit should work with the global menu bar.
We are already doing the same thing in FX. I've also added some cleanup into the fix. No test provided because we do not have tests for 
embedded mode.

With best regards. Petr.