[9] Review request for 8134917 [macosx] JOptionPane doesn't receive mouse events when opened from a drop event

[Alexander Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8134917
  webrev: http://cr.openjdk.java.net/~alexsch/8134917/webrev.00

  The fix corrects the typo introducing by the fix  JDK-8068886 that 
NSApplicationDefined constant is used instead of the corresponding mask 
for events filtering.

Thanks,
Alexandr.