Call JS functions via native context instead of js builtins object.

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index b051a044b4c532f835a2bdd16ee96c04d4236eab..a300346dcda1aba127cce734d9d34fb5d4b62ac9 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -1809,11 +1809,11 @@ utils.Export(function(to) {
   to.ToNameArray = ToNameArray;
 });
 
-utils.ExportToRuntime(function(to) {
-  to["global_eval_fun"] = GlobalEval;
-  to["object_define_own_property"] = DefineOwnPropertyFromAPI;
-  to["object_get_own_property_descriptor"] = ObjectGetOwnPropertyDescriptor;
-  to["to_complete_property_descriptor"] = ToCompletePropertyDescriptor;
-});
+%ExportToRuntime([
+  "global_eval_fun", GlobalEval,
+  "object_define_own_property", DefineOwnPropertyFromAPI,
+  "object_get_own_property_descriptor", ObjectGetOwnPropertyDescriptor,
+  "to_complete_property_descriptor", ToCompletePropertyDescriptor,
+]);
 
 })