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

src/proxy.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 182 matching lines @@
 
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.ProxyDelegateCallAndConstruct = DelegateCallAndConstruct;
   to.ProxyDerivedHasOwnTrap = DerivedHasOwnTrap;
   to.ProxyDerivedKeysTrap = DerivedKeysTrap;
 });
 
-utils.ExportToRuntime(function(to) {
-  to["derived_get_trap"] = DerivedGetTrap;
-  to["derived_has_trap"] = DerivedHasTrap;
-  to["derived_set_trap"] = DerivedSetTrap;
-  to["proxy_enumerate"] = ProxyEnumerate;
-});
+%InstallToContext([
+  "derived_get_trap", DerivedGetTrap,
+  "derived_has_trap", DerivedHasTrap,
+  "derived_set_trap", DerivedSetTrap,
+  "proxy_enumerate", ProxyEnumerate,
+]);
 
 })