/usr/share/unity-control-center/keybindings/50-compiz-navigation.xml is in compiz-gnome 1:0.9.13.0+16.10.20160818.2-5.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/unity-control-center/keybindings/../../gnome-control-center/keybindings/50-compiz-navigation.xml