/usr/share/php/ is in php-horde-injector 2.0.5-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Horde/
/usr/share/php/Horde/Injector/
/usr/share/php/Horde/Injector/Exception.php
/usr/share/php/Horde/Injector/Scope.php
/usr/share/php/Horde/Injector/TopLevel.php
/usr/share/php/Horde/Injector/DependencyFinder.php
/usr/share/php/Horde/Injector/Binder.php
/usr/share/php/Horde/Injector/Binder/
/usr/share/php/Horde/Injector/Binder/AnnotatedSetters.php
/usr/share/php/Horde/Injector/Binder/Factory.php
/usr/share/php/Horde/Injector/Binder/Implementation.php
/usr/share/php/Horde/Injector/Binder/Closure.php
/usr/share/php/Horde/Injector.php
/usr/share/php/.registry/
/usr/share/php/.registry/.channel.pear.horde.org/
/usr/share/php/.registry/.channel.pear.horde.org/horde_injector.reg