/usr/share/kde4/services/plasma-dataengine-mem_usage.desktop is in plasma-widget-memusage 0.3.3-0ubuntu4.
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=Memory Monitor Engine
X-KDE-ServiceTypes=Plasma/DataEngine
Type=Service
Icon=widgets/toolbox-button
X-KDE-Library=plasma_engine_memusage
X-Plasma-EngineName=memusage
X-KDE-PluginInfo-Author=Alexey Tyapkin
X-KDE-PluginInfo-Email=
X-KDE-PluginInfo-Name=memusage
X-KDE-PluginInfo-Version=0.3.2
X-KDE-PluginInfo-Website=
X-KDE-PluginInfo-Category=
X-KDE-PluginInfo-Depends=
X-Ubuntu-Gettext-Domain=desktop_plasma-widget-memusage
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