Pass return value of ext.onMessage listener through to chrome.runtime.onMessage

chrome/ext/common.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 21 matching lines @@
     var onMessage;
     if ("runtime" in chrome && "onMessage" in chrome.runtime)
       onMessage = chrome.runtime.onMessage;
     else if ("onMessage" in chrome.extension)
       onMessage = chrome.extension.onMessage;
     else
       onMessage = chrome.extension.onRequest;
 
     onMessage.addListener(function(message, sender, sendResponse)
     {
-      ext.onMessage._dispatch(message, wrapSender(sender), sendResponse);
+      return ext.onMessage._dispatch(message, wrapSender(sender), sendResponse);
     });
   };
 
   ext.onMessage = new ext._EventTarget();
 
 
   /* Background page */
 
   ext.backgroundPage = {
     sendMessage: sendMessage,
     getWindow: function()
     {
       return chrome.extension.getBackgroundPage();
     }
   };
 
 
   /* Utils */
 
   ext.getURL = chrome.extension.getURL;
   ext.i18n = chrome.i18n;
 })();