/usr/share/php/Symfony/ is in php-symfony-templating 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/
/usr/share/php/Symfony/Component/Templating/
/usr/share/php/Symfony/Component/Templating/DelegatingEngine.php
/usr/share/php/Symfony/Component/Templating/EngineInterface.php
/usr/share/php/Symfony/Component/Templating/Helper/
/usr/share/php/Symfony/Component/Templating/Helper/Helper.php
/usr/share/php/Symfony/Component/Templating/Helper/HelperInterface.php
/usr/share/php/Symfony/Component/Templating/Helper/SlotsHelper.php
/usr/share/php/Symfony/Component/Templating/Loader/
/usr/share/php/Symfony/Component/Templating/Loader/CacheLoader.php
/usr/share/php/Symfony/Component/Templating/Loader/ChainLoader.php
/usr/share/php/Symfony/Component/Templating/Loader/FilesystemLoader.php
/usr/share/php/Symfony/Component/Templating/Loader/Loader.php
/usr/share/php/Symfony/Component/Templating/Loader/LoaderInterface.php
/usr/share/php/Symfony/Component/Templating/PhpEngine.php
/usr/share/php/Symfony/Component/Templating/Storage/
/usr/share/php/Symfony/Component/Templating/Storage/FileStorage.php
/usr/share/php/Symfony/Component/Templating/Storage/Storage.php
/usr/share/php/Symfony/Component/Templating/Storage/StringStorage.php
/usr/share/php/Symfony/Component/Templating/StreamingEngineInterface.php
/usr/share/php/Symfony/Component/Templating/TemplateNameParser.php
/usr/share/php/Symfony/Component/Templating/TemplateNameParserInterface.php
/usr/share/php/Symfony/Component/Templating/TemplateReference.php
/usr/share/php/Symfony/Component/Templating/TemplateReferenceInterface.php
/usr/share/php/Symfony/Component/Templating/autoload.php