Added handling of override attempt using toSource to hook function

lib/hooks.js

 /*
  * This file is part of the Adblock Plus build tools,
  * Copyright (C) 2006-2012 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 33 matching lines @@
     {
       if (typeof cleanup == "function")
         cleanup();
     }
   };
   newFunc.toString = function()
   {
     dumbOverrideAttempt = true;
     return orig.toString();
   };
+  newFunc.toSource = function()
+  {
+    dumbOverrideAttempt = true;
+    return orig.toSource();
+  }
 
   obj.__defineGetter__(name, function()
   {
     dumbOverrideAttempt = false;
     return newFunc;
   });
 
   obj.__defineSetter__(name, function(value)
   {
     if (dumbOverrideAttempt)
@@ skipping 15 matching lines @@
     {
       obj.__defineGetter__(name, origGet);
     }
     if (origSet)
     {
       obj.__defineSetter__(name, origSet);
     }
   };
 }
 exports.hook = hook;