Code Review Request for 8020310: JDK-6356530 broke the old build

[Valerie (Yu-Ching) Peng]

While working w/ Dave for a JCE provider build, I ran into a build 
failure due to a javac change, i.e. 6356530 " -Xlint:serial does not 
flag abstract classes with concrete methods/members".  The new-infra 
build does not have this problem, only the old build does.

Here is the bug id and its webrev:

8020310: JDK-6356530 broke the old build
http://cr.openjdk.java.net/~valeriep/8020310/webrev.00/


Can someone please help review this trivial fix quickly? No regression 
test since it's trivial and the old build passes with the fix.

Thanks,
Valerie