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 6bcfc1128d3c446b8e2262f2c1cb88085b9c5cf2..3dafc1d516934cd3177f62c4f3d18d8c6d5a0080 100644
--- a/chrome/renderer/resources/extensions/miscellaneous_bindings.js
+++ b/chrome/renderer/resources/extensions/miscellaneous_bindings.js
@@ -7,16 +7,14 @@
 // scripts or background pages.
 // See user_script_slave.cc for script that is loaded by content scripts only.
 
-var chrome = chrome || {};
 (function () {
-  native function CloseChannel(portId, notifyBrowser);
-  native function PortAddRef(portId);
-  native function PortRelease(portId);
-  native function PostMessage(portId, msg);
-  native function GetChromeHidden();
-  native function Print();
-
-  var chromeHidden = GetChromeHidden();
+  var miscNatives = requireNative('miscellaneous_bindings');
+  var CloseChannel = miscNatives.CloseChannel;
+  var PortAddRef = miscNatives.PortAddRef;
+  var PortRelease = miscNatives.PortRelease;
+  var PostMessage = miscNatives.PostMessage;
+
+  var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
   var manifestVersion;
   var extensionId;