/usr/share/php/Symfony/Component/Security/Core/Authorization/ is in php-symfony-security 2.7.10-0ubuntu2.
This file is owned by root:root, with mode 0o755.
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/usr/share/php/Symfony/Component/Security/Core/Authorization/AccessDecisionManager.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/AccessDecisionManagerInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/AuthorizationChecker.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/AuthorizationCheckerInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/ExpressionLanguage.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/ExpressionLanguageProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/Voter/
/usr/share/php/Symfony/Component/Security/Core/Authorization/Voter/AbstractVoter.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/Voter/AuthenticatedVoter.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/Voter/ExpressionVoter.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/Voter/RoleHierarchyVoter.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/Voter/RoleVoter.php
/usr/share/php/Symfony/Component/Security/Core/Authorization/Voter/VoterInterface.php