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 ad47748ae0c5bd90f3becc5baefb23e8e9946df5..10948f5b1965fdc86ea223d80147b1c6fa7e1531 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 = natives.GetChromeHidden();
 
 /**
  * Validates an instance against a schema and accumulates errors. Usage:
@@ -447,5 +445,3 @@ chromeHidden.JSONSchemaValidator.prototype.addError = function(
     message: chromeHidden.JSONSchemaValidator.formatError(key, replacements)
   });
 };
-
-})();