[9] review request: 8139326: [TEST] Unit tests for JFXPanel with security manager don't detect errors

[Kevin Rushforth]

Chien,

Please review the following test fix:

https://bugs.openjdk.java.net/browse/JDK-8139326
http://cr.openjdk.java.net/~kcr/8139326/webrev.00/

-- Kevin