Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/miscellaneous_bindings.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This script contains unprivileged javascript APIs related to chrome
 // extensions.  It is loaded by any extension-related context, such as content
 // 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 miscNatives = requireNative('miscellaneous_bindings');
+  var CloseChannel = miscNatives.CloseChannel;
+  var PortAddRef = miscNatives.PortAddRef;
+  var PortRelease = miscNatives.PortRelease;
+  var PostMessage = miscNatives.PostMessage;
 
-  var chromeHidden = GetChromeHidden();
+  var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
   var manifestVersion;
   var extensionId;
 
   // The reserved channel name for the sendRequest API.
   chromeHidden.kRequestChannel = "chrome.extension.sendRequest";
 
   // Map of port IDs to port object.
   var ports = {};
 
   // Map of port IDs to chromeHidden.onUnload listeners. Keep track of these
@@ skipping 174 matching lines @@
     chrome.extension = chrome.extension || {};
 
     if (manifestVersion < 2) {
       chrome.self = chrome.extension;
       chrome.extension.inIncognitoTab = inIncognitoContext;
     }
 
     chrome.extension.inIncognitoContext = inIncognitoContext;
   });
 })();