goprotobuf: update extension test to new signature for testing.Main. This is an unpleasant dependency, to put it politely.
goprotobuf: update extension test to new signature for testing.Main.
This is an unpleasant dependency, to put it politely.

R=dsymonds, r
CC=golang-dev
http://codereview.appspot.com/5310047

adwinsky/goprotobuf,supiyun/goprotobuf,polydawn-ports/goprotobuf,t3rm1n4l/goprotobuf,tonnerre/go-protobuf,liumuqi/goprotobuf,ruiaylin/goprotobuf,wfxiang08/goprotobuf