[TESTS] Backported r24473 to trunk

ArrayCollection needs to extend ArrayObject

- Test clearly shows it being used in Array-like situation; to do so, must
  extend ArrayObject. Tests now pass.

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@24475 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Amf/Value/Messaging/ArrayCollection.php

@@ -30,6 +30,6 @@
  * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
-class Zend_Amf_Value_Messaging_ArrayCollection
+class Zend_Amf_Value_Messaging_ArrayCollection extends ArrayObject
 {
 }