/usr/share/kde4/services/plasma-applet-nextwallpaper.desktop is in plasma-widget-nextwallpaper 0.2.1-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=Next wallpaper
Comment=Change the current wallpaper
Type=Service
ServiceTypes=Plasma/Applet
X-KDE-Library=plasma_applet_nextwallpaper
X-KDE-PluginInfo-Author=David Palacio
X-KDE-PluginInfo-Email=dpalacio@uninorte.edu.co
X-KDE-PluginInfo-Name=plasma_applet_nextwallpaper
X-KDE-PluginInfo-Version=0.1
X-KDE-PluginInfo-Website=http://bakalacio.blogspot.com/
X-KDE-PluginInfo-Category=Examples
X-KDE-PluginInfo-Depends=
X-KDE-PluginInfo-License=GPL
X-KDE-PluginInfo-EnabledByDefault=true
X-Ubuntu-Gettext-Domain=desktop_plasma-widget-nextwallpaper
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