goprotobuf: update to go 1 import strings

R=dsymonds
CC=golang-dev
http://codereview.appspot.com/5496065
diff --git a/proto/text_test.go b/proto/text_test.go
index 8b55b84..18c0a5f 100644
--- a/proto/text_test.go
+++ b/proto/text_test.go
@@ -36,7 +36,7 @@
 	"strings"
 	"testing"
 
-	"goprotobuf.googlecode.com/hg/proto"
+	"code.google.com/p/goprotobuf/proto"
 
 	pb "./testdata/_obj/test_proto"
 )