/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/ is in php-symfony-security 2.7.10-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/AnonymousAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/AuthenticationProviderInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/DaoAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/RememberMeAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/SimpleAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/UserAuthenticationProvider.php