[8u60, 9] review request: RT-46186: FX application hangs on exit when media gets stuck

[Kirill Kirichenko]

Hi Alexander, Kevin.

Could you please review the following fix?
jira: https://javafx-jira.kenai.com/browse/RT-46186
wevrev: http://cr.openjdk.java.net/~stayer/RT-46186/webrev.00/

Please review and comment in JIRA if it's still in read-write mode ?

K