codereview: always use HTTPS
codereview: always use HTTPS

The new version of rietveld pushed 1.5 hours ago
requires HTTPS now, otherwise it issues a 301
to HTTPS which we barfed on.

R=golang-dev
CC=golang-dev
https://codereview.appspot.com/6782135

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