Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/experimental.declarative_custom_bindings.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Custom bindings for the declarative API.
 
 (function() {
 
-native function GetChromeHidden();
-
-var chromeHidden = GetChromeHidden();
+var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
 chromeHidden.registerCustomHook(
     'experimental.declarative',
     function(bindingsAPI) {
   var apiFunctions = bindingsAPI.apiFunctions;
   var sendRequest = bindingsAPI.sendRequest;
   var apiDefinitions = bindingsAPI.apiDefinitions;
   var cachedEventOptions = {};
 
   function getEventOptions(qualifiedEventName) {
@@ skipping 52 matching lines @@
     }
     validateRules(rules,
                   eventOptions.conditions,
                   eventOptions.actions);
     sendRequest(this.name, [eventName, rules, opt_callback],
                 this.definition.parameters);
   });
 });
 
 })();