goprotobuf: gofixes for reflect API changes.

R=dsymonds
CC=golang-dev
http://codereview.appspot.com/4425077
diff --git a/proto/text.go b/proto/text.go
index 3f2eac4..10f24b6 100644
--- a/proto/text.go
+++ b/proto/text.go
@@ -198,7 +198,7 @@
 	aw.complete = true
 	aw.compact = compact
 
-	v := reflect.NewValue(pb)
+	v := reflect.ValueOf(pb)
 	// We should normally be passed a struct, or a pointer to a struct,
 	// and we don't want the outer < and > in that case.
 	v = reflect.Indirect(v)