/usr/share/vala-0.18/vapi/libpanelapplet-2.0.deps is in valac-0.18-vapi 0.18.1-0ubuntu11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3
gtk+-2.0 libgnomeui-2.0 libbonoboui-2.0