/usr/share/php/Symfony/Component/ is in php-symfony-event-dispatcher 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/EventDispatcher/
/usr/share/php/Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php
/usr/share/php/Symfony/Component/EventDispatcher/Debug/
/usr/share/php/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcher.php
/usr/share/php/Symfony/Component/EventDispatcher/Debug/TraceableEventDispatcherInterface.php
/usr/share/php/Symfony/Component/EventDispatcher/Debug/WrappedListener.php
/usr/share/php/Symfony/Component/EventDispatcher/DependencyInjection/
/usr/share/php/Symfony/Component/EventDispatcher/DependencyInjection/RegisterListenersPass.php
/usr/share/php/Symfony/Component/EventDispatcher/Event.php
/usr/share/php/Symfony/Component/EventDispatcher/EventDispatcher.php
/usr/share/php/Symfony/Component/EventDispatcher/EventDispatcherInterface.php
/usr/share/php/Symfony/Component/EventDispatcher/EventSubscriberInterface.php
/usr/share/php/Symfony/Component/EventDispatcher/GenericEvent.php
/usr/share/php/Symfony/Component/EventDispatcher/ImmutableEventDispatcher.php
/usr/share/php/Symfony/Component/EventDispatcher/autoload.php