/usr/share/glib-2.0/schemas/10_mutter-common.gschema.override is in mutter-common 3.4.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [org.gnome.mutter.keybindings]
toggle-tiled-left = ['<Super>Left','<Primary><Super>Left']
toggle-tiled-right = ['<Super>Right','<Primary><Super>Right']
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