DDC-3078 - cache instantiator related exceptions are not needed anymore

lib/Doctrine/ORM/ORMException.php

@@ -262,19 +262,6 @@ class ORMException extends Exception
         return new self("Invalid repository class '".$className."'. It must be a Doctrine\Common\Persistence\ObjectRepository.");
     }
 
-    /**
-     * @param mixed $instantiator
-     *
-     * @return ORMException
-     */
-    public static function invalidSecondLevelCacheInstantiator($instantiator)
-    {
-        return new self(sprintf(
-            'The provided instantiator is not a valid callable, "%s" given.',
-            is_object($instantiator) ? get_class($instantiator) : gettype($instantiator)
-        ));
-    }
-
     /**
      * @param string $className
      * @param string $fieldName