[8u] Review request: RT-40280 Refactor duplicated editor code in ComboBox and DatePicker skins.

[Leif Samuelsson]

Hi Jonathan,

Please review this fix involving skins based on ComboBoListViewSkin.

https://javafx-jira.kenai.com/browse/RT-40280
http://cr.openjdk.java.net/~leifs/rt40280/webrev.01/

Thanks,
Leif