[8u60] Review request for RT-39645: Mac OSX Yosemite StageStyle.UTILITY comes up with wrong window decoration

[Morris Meyer]

Kevin and David,

Could you please review my changes to Glass-Mac for 
StageStyle.UTILITY?   These have been tested on 10.10.

Thanks much,

        --morris

JIRA - https://javafx-jira.kenai.com/browse/RT-39645
WEBREV - http://cr.openjdk.java.net/~morris/RT-39645.01