exp/winfsnotify: remove reference to _test Updates issue 2573.
exp/winfsnotify: remove reference to _test
Updates issue 2573.

R=golang-dev, dsymonds, r
CC=golang-dev
http://codereview.appspot.com/5677063

wesolows/golang-old,wesolows/golang,wesolows/golang,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old