[Security] Fixed tests
minor #13061 [Security] Fixed tests (saro0h)

This PR was merged into the 2.5 branch.

Discussion
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[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).

Commits
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5aa3ef4 [Security] Fixed tests