Use AuthComponent instead of CakeSession

Model/Behavior/WhoDidItBehavior.php

@@ -10,7 +10,7 @@
  * @license http://opensource.org/licenses/mit-license.php MIT
  */
 
-App::uses('CakeSession', 'Model/Datasource');
+App::uses('AuthComponent', 'Controller/Component');
 App::uses('ModelBehavior', 'Model');
 
 /**
@@ -116,7 +116,7 @@ class WhoDidItBehavior extends ModelBehavior {
 		$authSession = $config['auth_session'];
 		list(, $userSession) = pluginSplit($config['user_model']);
 
-		$userId = CakeSession::read($authSession . '.' . $userSession . '.id');
+		$userId = AuthComponent::user($authSession . '.' . $userSession . '.id');
 
 		if (!$userId) {
 			return true;