[7.0] Remove remaining deprecated code paths

Author: nicolas-grekas

CHANGELOG.md

@@ -1,6 +1,12 @@
 CHANGELOG
 =========
 
+7.0
+---
+
+ * Remove the `Security` class, use `Symfony\Bundle\SecurityBundle\Security` instead
+ * Require explicit argument when calling `TokenStorage::setToken()`
+
 6.3
 ---