Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/schema_generated_bindings.js

Index: chrome/renderer/resources/extensions/schema_generated_bindings.js
diff --git a/chrome/renderer/resources/extensions/schema_generated_bindings.js b/chrome/renderer/resources/extensions/schema_generated_bindings.js
index a935ff9db7e14d2a04668a7c42f63e3f3ae8b218..86f6070c523ce4235ace8c36cbe2ff6776bdd12d 100644
--- a/chrome/renderer/resources/extensions/schema_generated_bindings.js
+++ b/chrome/renderer/resources/extensions/schema_generated_bindings.js
@@ -5,13 +5,11 @@
 // This script contains privileged chrome extension related javascript APIs.
 // It is loaded by pages whose URL has the chrome-extension protocol.
 
-var chrome = chrome || {};
-(function() {
-  native function GetChromeHidden();
-  native function GetExtensionAPIDefinition();
-  native function GetNextRequestId();
-  native function StartRequest();
-  native function SetIconCommon();
+  var GetChromeHidden = natives.GetChromeHidden;
+  var GetExtensionAPIDefinition = natives.GetExtensionAPIDefinition;
+  var GetNextRequestId = natives.GetNextRequestId;
+  var StartRequest = natives.StartRequest;
+  var SetIconCommon = natives.SetIconCommon;
 
   var chromeHidden = GetChromeHidden();
 
@@ -580,4 +578,3 @@ var chrome = chrome || {};
     if (apiExists("test"))
       chrome.test.getApiDefinitions = GetExtensionAPIDefinition;
   });
-})();