[8u40] Review request for RT-38915: [Mac,JFXPanel] WebView draws duplicate image on Retina display

[Anton V. Tarasov]

Hi Steve,

Please, review the fix:

https://javafx-jira.kenai.com/browse/RT-38915
http://cr.openjdk.java.net/~ant/RT-38915/webrev.0

Where some additional cleanup (field reset) is made on JFXPanel disposal.

Thanks,
Anton.