/usr/share/doc/browser-plugin-packagekit/changelog.Debian.gz is in browser-plugin-packagekit 0.8.17-4ubuntu6~gcc5.4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/browser-plugin-packagekit/../libpackagekit-glib2-16/changelog.Debian.gz