[8u40] Code Review Request for RT-38726: Scene and scenegraph leak when the Stage is closed

[Chien Yang]

Hi Kevin and Morris,

Please review the proposed fix:

JIRA: https://javafx-jira.kenai.com/browse/RT-38726
Webrev: http://cr.openjdk.java.net/~ckyang/RT-38726/webrev.00/

Thanks,
- Chien