/usr/share/dbus-1/services/com.canonical.OnlineAccountsUi.service is in ubuntu-system-settings-online-accounts 0.3+14.04.20140328-0ubuntu3.
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=com.canonical.OnlineAccountsUi
Exec=/usr/bin/online-accounts-ui --desktop_file_hint=/usr/share/applications/online-accounts-ui.desktop
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