/usr/share/glib-2.0/schemas/10_gnome-shell.gschema.override is in gnome-shell 3.18.4-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | [org.gnome.shell]
favorite-apps=[ 'firefox.desktop', 'evolution.desktop', 'empathy.desktop', 'rhythmbox.desktop', 'libreoffice-writer.desktop', 'org.gnome.Nautilus.desktop', 'yelp.desktop' ]
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