/usr/share/php/Symfony/Component/HttpKernel/EventListener/ is in php-symfony-http-kernel 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/HttpKernel/EventListener/AbstractSessionListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/AbstractTestSessionListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/AddRequestFormatsListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/DumpListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/FragmentListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/LocaleListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/ResponseListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/RouterListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/SaveSessionListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/SessionListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/StreamedResponseListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/SurrogateListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/TestSessionListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/TranslatorListener.php
/usr/share/php/Symfony/Component/HttpKernel/EventListener/ValidateRequestListener.php