[9] Review Request for 7190544: Nimbus LaF: regression UnitTest failure

[Semyon Sadetsky]

Hello,

Please review JDK9 fix:
webrev: http://cr.openjdk.java.net/~ssadetsky/7190544/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-7190544

***ROOT CAUSE
The divider size field is not set for the split pane UI during Synth 
style initialization.

***SOLUTION
Set the field.

***TESTING
Not need. This is a reg test failure.

--Semyon