http: disable sniffer for now.
http: disable sniffer for now.

Something is broken, and investigation is underway.
In the meantime, godoc is broken, so disable sniffing for now
by reverting to the pre-sniffer state.

R=r
CC=golang-dev
http://codereview.appspot.com/4809046

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