Fix CS.

Author: dereuromark

tests/TestCase/Authenticator/PrimaryKeySessionAuthenticatorTest.php

@@ -19,7 +19,6 @@
 use ArrayObject;
 use Authentication\Authenticator\PrimaryKeySessionAuthenticator;
 use Authentication\Authenticator\Result;
-use Authentication\Authenticator\SessionAuthenticator;
 use Authentication\Identifier\IdentifierCollection;
 use Cake\Http\Exception\UnauthorizedException;
 use Cake\Http\Response;