Work around compiler bug.

A bug in the openjdk compiler results in incorrect bytecode
for the anonymous class defined within the scope of the
constructor. To workaround it, use a named class instead.

This transformation does not incur any additional cost in
terms of code size or memory usage.

bug: 8992787
Change-Id: I444f7983e2df95007705acec91d7f1a348252e27