[9] Review Request for 8130430: [TEST_BUG] remove unnecessary internal calls from javax/swing/JRadioButton/8075609/bug8075609.java

[Yuri Nesterenko]

Colleagues,

please review this test fix;
webrev:
http://cr.openjdk.java.net/~yan/8130430/webrev.00/
CR:
https://bugs.openjdk.java.net/browse/JDK-8130430

Removed some calls of internal API and a couple of typos fixed
in a single test.

Thanks,
-yan