A MessageObject is a purely internal object to hold information about

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 16a186fe6e9cb1b4979553e895620855ff56e4c8..6db9a4819a3d6153706ab71bf9c579abedb2e4fd 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1050,7 +1050,6 @@ void Genesis::InstallNativeFunctions() {
   INSTALL_NATIVE(JSFunction, "Instantiate", instantiate_fun);
   INSTALL_NATIVE(JSFunction, "ConfigureTemplateInstance",
                  configure_instance_fun);
-  INSTALL_NATIVE(JSFunction, "MakeMessage", make_message_fun);
   INSTALL_NATIVE(JSFunction, "GetStackTraceLine", get_stack_trace_line_fun);
   INSTALL_NATIVE(JSObject, "functionCache", function_cache);
 }