[9] Review request for 8179027: JComboBox too small under Windows LAF

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8179027

webrev: http://cr.openjdk.java.net/~ssadetsky/8179027/webrev.00/

This a regression introduced by JDK-6490753. The updated JComboBox look 
and feel affected JComboBox preferred size calculation. In the fix the 
size calculation was updated to fit the new L&F.

--Semyon