[8] Review request for 8000969 [macosx] Directories are not deselected when JFileChooser has FILES_ONLY selection mode

[Alexander Scherbatiy]

bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8000969
webrev: http://cr.openjdk.java.net/~alexsch/8000969/webrev.00/
The fix deselects directories when the a JFileChooser has FILES_ONLY 
selection mode.

The the DIRECTORIES_ONLY selection mode disables files so it is 
necessary to do nothing in this case.

Thanks,
Alexandr.