[8] Please review fix for 7144064: [macosx] "Could not find class" error in JTree's ctor when called in headless mode

[Alexander Zuev]

Hello,

   could you please take a look at this forward-port of the fix that did 
not make it from jdk7 to jdk8.

Bug description can be seen here: 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7144064
Webrev can be found here: http://cr.openjdk.java.net/~kizune/7144064/webrev/

With best regards,
Alex