[8u] RFR 8196092: javax/swing/JComboBox/8032878/bug8032878.java fails

[Zhengyu Gu]

I would like to backport this patch to 8u to fix the test, as it is not 
in 8u's ProblemList.

The original bug: https://bugs.openjdk.java.net/browse/JDK-8196092
The original patch: https://github.com/openjdk/jdk/commit/2ee795d9

The original patch does not apply cleanly, only due to the test is not 
in 8u's ProblemList.

8u webrev: http://cr.openjdk.java.net/~zgu/JDK-8196092-8u/webrev.00/

Test failed with this patch and passed with it.

Thanks,

-Zhengyu