Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/miscellaneous_bindings.js

Index: chrome/renderer/resources/extensions/miscellaneous_bindings.js
diff --git a/chrome/renderer/resources/extensions/miscellaneous_bindings.js b/chrome/renderer/resources/extensions/miscellaneous_bindings.js
index 37ce11dd6d7ba45885b4b3d1a5f582868f9a3368..c436e9217d459982a00b0a02fa4660b53ec88fd5 100644
--- a/chrome/renderer/resources/extensions/miscellaneous_bindings.js
+++ b/chrome/renderer/resources/extensions/miscellaneous_bindings.js
@@ -8,16 +8,14 @@
 // See user_script_slave.cc for script that is loaded by content scripts only.
 // TODO(mpcomplete): we also load this in regular web pages, but don't need to.
 
-var chrome = chrome || {};
-(function () {
-  native function OpenChannelToExtension(sourceId, targetId, name);
-  native function CloseChannel(portId, notifyBrowser);
-  native function PortAddRef(portId);
-  native function PortRelease(portId);
-  native function PostMessage(portId, msg);
-  native function GetChromeHidden();
-  native function GetL10nMessage();
-  native function Print();
+  var OpenChannelToExtension = natives.OpenChannelToExtension;
+  var CloseChannel = natives.CloseChannel;
+  var PortAddRef = natives.PortAddRef;
+  var PortRelease = natives.PortRelease;
+  var PostMessage = natives.PostMessage;
+  var GetChromeHidden = natives.GetChromeHidden;
+  var GetL10nMessage = natives.GetL10nMessage;
+  var Print = natives.Print;
 
   var chromeHidden = GetChromeHidden();
   var manifestVersion;
@@ -289,5 +287,3 @@ var chrome = chrome || {};
       return GetL10nMessage(message_name, placeholders, extensionId);
     };
   });
-
-})();