Rewrite this a little to make it clear that we're now only checking the super class's beta-methods vector to make sure this is even an overrideable method.
Rewrite this a little to make it clear that we're now only checking the
super class's beta-methods vector to make sure this is even an overrideable
method.

svn: r18181

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket