[9] review request: 8156591: IllegalAccessError in JFXPanel after fix for JDK-8080395

[Kevin Rushforth]

Phil or Semyon,

Please review the following simple fix to comment out JFXPanel's use of 
the (now package-private) sun.awt.CausedFocusEvent class:

https://bugs.openjdk.java.net/browse/JDK-8156591
http://cr.openjdk.java.net/~kcr/8156591/webrev.00/

-- Kevin