[8u20] Request for approval to backport of Nashorn test fix from jdk9/dev to jdk8u20

[Matherey Nunez]

Hi,

Please approve the backport of following test fix:
Bug: https://bugs.openjdk.java.net/browse/JDK-8039403
jdk9-dev changeset: 
http://hg.openjdk.java.net/jdk9/dev/nashorn/rev/37d6d1a120b5
applies cleanly to 8u-dev

Thanks,
Matherey