/usr/share/php/Symfony/Component/HttpKernel/DataCollector/ is in php-symfony-http-kernel 2.3.21+dfsg-4+deb8u3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/DataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/DataCollectorInterface.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/ExceptionDataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/RouterDataCollector.php
/usr/share/php/Symfony/Component/HttpKernel/DataCollector/TimeDataCollector.php