Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/omnibox_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 omnibox API. Only injected into the v8 contexts
 // for extensions which have permission for the omnibox API.
 
-(function() {
-
-native function GetChromeHidden();
+var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
 // Remove invalid characters from |text| so that it is suitable to use
 // for |AutocompleteMatch::contents|.
 function sanitizeString(text, shouldTrim) {
   // NOTE: This logic mirrors |AutocompleteMatch::SanitizeString()|.
   // 0x2028 = line separator; 0x2029 = paragraph separator.
   var kRemoveChars = /(\r|\n|\t|\u2028|\u2029)/gm;
   if (shouldTrim)
     text = text.trimLeft();
   return text.replace(kRemoveChars, '');
@@ skipping 51 matching lines @@
 
       // Descend into all other nodes, even if they are unrecognized, for
       // forward compat.
       arguments.callee(child);
     }
   })(root);
 
   return result;
 }
 
-GetChromeHidden().registerCustomHook('omnibox', function(bindingsAPI) {
+chromeHidden.registerCustomHook('omnibox', function(bindingsAPI) {
   var apiFunctions = bindingsAPI.apiFunctions;
   var sendRequest = bindingsAPI.sendRequest;
 
   apiFunctions.setHandleRequest('setDefaultSuggestion', function(details) {
     var parseResult = parseOmniboxDescription(details.description);
     sendRequest(this.name, [parseResult], this.definition.parameters);
   });
 
   apiFunctions.setUpdateArgumentsPostValidate(
       'sendSuggestions', function(requestId, userSuggestions) {
     var suggestions = [];
     for (var i = 0; i < userSuggestions.length; i++) {
       var parseResult = parseOmniboxDescription(
           userSuggestions[i].description);
       parseResult.content = userSuggestions[i].content;
       suggestions.push(parseResult);
     }
     return [requestId, suggestions];
   });
 
   chrome.omnibox.onInputChanged.dispatch =
       function(text, requestId) {
     var suggestCallback = function(suggestions) {
       chrome.omnibox.sendSuggestions(requestId, suggestions);
     };
     chrome.Event.prototype.dispatch.apply(this, [text, suggestCallback]);
   };
 });
-
-})();