/usr/share/php/Guzzle/Common/ is in php-guzzle 3.9.2+dfsg-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Guzzle/Common/AbstractHasDispatcher.php
/usr/share/php/Guzzle/Common/Collection.php
/usr/share/php/Guzzle/Common/Event.php
/usr/share/php/Guzzle/Common/Exception/
/usr/share/php/Guzzle/Common/Exception/BadMethodCallException.php
/usr/share/php/Guzzle/Common/Exception/ExceptionCollection.php
/usr/share/php/Guzzle/Common/Exception/GuzzleException.php
/usr/share/php/Guzzle/Common/Exception/InvalidArgumentException.php
/usr/share/php/Guzzle/Common/Exception/RuntimeException.php
/usr/share/php/Guzzle/Common/Exception/UnexpectedValueException.php
/usr/share/php/Guzzle/Common/FromConfigInterface.php
/usr/share/php/Guzzle/Common/HasDispatcherInterface.php
/usr/share/php/Guzzle/Common/ToArrayInterface.php
/usr/share/php/Guzzle/Common/Version.php