/etc/xdg/autostart/gnome-sound-applet.desktop is in gnome-control-center-data 1:3.4.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | [Desktop Entry]
Name=Volume Control
Comment=Show desktop volume control
Icon=multimedia-volume-control
Exec=gnome-sound-applet
Terminal=false
Type=Application
Categories=
NoDisplay=true
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=gnome-control-center
X-GNOME-Bugzilla-Component=sound
# See http://bugzilla.gnome.org/show_bug.cgi?id=568320
#X-GNOME-Autostart-Phase=Panel
X-GNOME-Autostart-Notify=true
AutostartCondition=GNOME3 if-session gnome-fallback
OnlyShowIn=;
X-Ubuntu-Gettext-Domain=gnome-control-center-2.0
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