runtime: remove declaration of function that does not exist
runtime: remove declaration of function that does not exist

R=golang-dev, dsymonds
CC=golang-dev
https://codereview.appspot.com/10730045

pombredanne/go-deleteme,gnanderson/go,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,gnanderson/go,gnanderson/go,tv42/old-go,apparentlymart/golang,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,apparentlymart/golang,gnanderson/go,apparentlymart/golang,apparentlymart/golang,pombredanne/go-deleteme