/usr/share/dbus-1/services/org.gnome.MobileMediaService.service is in gstreamer-dbus-media-service 0.1.17-upstream-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.moblin.MobileMediaService
Exec=/usr/bin/gst-media-service
|