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

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 19 matching lines @@
     {
       if (this._listeners.indexOf(listener) == -1)
         this._listeners.push(listener);
     },
     removeListener: function(listener)
     {
       var idx = this._listeners.indexOf(listener);
       if (idx != -1)
         this._listeners.splice(idx, 1);
     },
-    _dispatch: function(cancelable, args)
+    _dispatch: function()
     {
+      var result = null;
+
       for (var i = 0; i < this._listeners.length; i++)
       {
-        var result = this._listeners[i].apply(null, arguments);
+        result = this._listeners[i].apply(null, arguments);
+
         if (this._cancelable && result === false)
-          return false;
+          break;
       }
-      return true;
+
+      return result;
     }
   };
 })();