[8u] RFR: 8240633: Memory leaks in the implementations of FileChooserUI

[Alex Kashchenko]

Hi,

Please review a backport of a Mac-specific fix:

Bug: https://bugs.openjdk.java.net/browse/JDK-8240633

Original commit: https://hg.openjdk.java.net/jdk/jdk/rev/45273ef93e6f

8u webrev: https://cr.openjdk.java.net/~akasko/jdk8u/8240633/webrev/

Only changes are to paths and copyright years. Testing: checked that
added test fails without the patch and passes with the patch.

-- 
-Alex