goprotobuf: gofixes for reflect API changes.

R=dsymonds
CC=golang-dev
http://codereview.appspot.com/4425077
diff --git a/proto/properties.go b/proto/properties.go
index bc0101c..6129acd 100644
--- a/proto/properties.go
+++ b/proto/properties.go
@@ -531,7 +531,7 @@
 	}
 
 	// get the reflect type of the struct.
-	t = reflect.Typeof(pb)
+	t = reflect.TypeOf(pb)
 	return
 }