Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/json_schema.js

Index: chrome/renderer/resources/extensions/json_schema.js
diff --git a/chrome/renderer/resources/extensions/json_schema.js b/chrome/renderer/resources/extensions/json_schema.js
index f1fdf9e329cc7a13e7d34289b40dc4c236000155..bc51d9717e03be596ad87a355731b1c1b3193b6c 100644
--- a/chrome/renderer/resources/extensions/json_schema.js
+++ b/chrome/renderer/resources/extensions/json_schema.js
@@ -38,9 +38,7 @@
 //   additional properties will be validated.
 //==============================================================================
 
-(function() {
-native function GetChromeHidden();
-var chromeHidden = GetChromeHidden();
+var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
 function isInstanceOfClass(instance, className) {
   if (!instance)
@@ -498,5 +496,3 @@ chromeHidden.JSONSchemaValidator.prototype.addError =
 chromeHidden.JSONSchemaValidator.prototype.resetErrors = function() {
   this.errors = [];
 };
-
-})();