[8u40] RFR: RT-38973: Media produces extraneous debugging when running Ensemble8

[David DeHaven]

Kevin, Kirill, please review the following fix for 8u40:

JIRA:
https://javafx-jira.kenai.com/browse/RT-38973

Webrev: 
http://cr.openjdk.java.net/~ddehaven/RT-38973/rt.0/

I added an additional (annoying) compiler warning fix.

-DrD-