[9] Review request: 8166013: NestedTableColumnHeader: must use factory method for header creation always

[Jonathan Giles]

Kevin and / or Vadim,

Please review the fix for the following issue:

https://bugs.openjdk.java.net/browse/JDK-8166013
http://cr.openjdk.java.net/~jgiles/8166013.1/

Thanks!

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-- Jonathan