/usr/share/doc/libunity-gtk2-parser-dev/changelog.Debian.gz is in libunity-gtk2-parser-dev 0.0.0+14.04.20140403-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libunity-gtk2-parser-dev/../libunity-gtk2-parser0/changelog.Debian.gz