[8u60] Request for approval: JDK-8098808: Convert Scope from interface to class

[Hannes Wallnoefer]

Please approve backport of JDK-8098808 to 8u60:

Bug: https://bugs.openjdk.java.net/browse/JDK-8098808
Webrev: http://cr.openjdk.java.net/~hannesw/8098808/
Review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-June/004774.html

The patch applies cleanly to 8u-dev after path reshuffling.

Thanks,
Hannes