/usr/share/php/Symfony/Component/Cache/Adapter/ is in php-symfony-cache 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/Cache/Adapter/AbstractAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/AdapterInterface.php
/usr/share/php/Symfony/Component/Cache/Adapter/ApcuAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/ArrayAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/ChainAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/DoctrineAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/FilesystemAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/NullAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/PdoAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/PhpArrayAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/PhpFilesAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/ProxyAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/RedisAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/SimpleCacheAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/TagAwareAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/TagAwareAdapterInterface.php
/usr/share/php/Symfony/Component/Cache/Adapter/TraceableAdapter.php
/usr/share/php/Symfony/Component/Cache/Adapter/TraceableTagAwareAdapter.php