/usr/share/applications/unity-webapps-qml-facebookmessenger-example.desktop is in unity-webapps-qml-examples 0.1+14.04.20140408-0ubuntu1.
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=FacebookMessengerWebappsQMLExample
Type=Application
Exec=/usr/bin/unity-webapps-qml-launcher --qml=/usr/share/unity-webapps-qml/examples/unity-webapps-example-facebookmessenger/main.qml --app-id=unity-webapps-qml-facebookmessenger-example
Path=/usr/share/unity-webapps-qml/examples/unity-webapps-example-facebookmessenger
GenericName=FacebookMessenger WebBrowser Container Example
Icon=qmlscene
Terminal=false
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