[Security] Fixed tests

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ~
| License       | MIT
| Doc PR        | ~

Fixes the tests failing (https://travis-ci.org/symfony/symfony/jobs/44732074#L896)

This class have been removed in 2.3 (https://github.com/symfony/symfony/pull/13033) but is actually used since 2.4 (when the split of the Security component has been made).