[7u-next] Request for approval for CR 8010282: sun.net.www.protocol.jar.JarFileFactory.close(JarFile) should be thread-safe

[Chris Hegarty]

This is a request for approval to backport a product fix that eliminates 
a race on, and visibility issues, on url jar file caching.

http://bugs.sun.com/view_bug.do?bug_id=8010282
JDK8 changeset:
  http://hg.openjdk.java.net/jdk8/tl/jdk/rev/3070b7363853

JDK8 review thread:
  http://mail.openjdk.java.net/pipermail/net-dev/2013-March/005893.html

Identical changeset to that of JDK8.

-Chris.