/usr/share/glib-2.0/schemas/10_ubuntu-dock.gschema.override is in gnome-shell-extension-ubuntu-dock 0.9.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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dock-fixed=true
intellihide-mode='ALL_WINDOWS'
icon-size-fixed=true
custom-theme-shrink=true
custom-theme-customize-running-dots=true
running-indicator-style='DOTS'
custom-theme-running-dots-color='#e95420'
custom-theme-running-dots-border-color='#e95420'
extend-height=true
transparency-mode='ADAPTIVE'
scroll-action='switch-workspace'
click-action='previews'
shift-click-action='launch'
middle-click-action='launch'
shift-middle-click-action='minimize'
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