require Mercurial 1.3 again (how did that get dropped?)
require Mercurial 1.3 again (how did that get dropped?)

avoid deprecation warning about os.popen3

R=r
http://go/go-review/1026018

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go