/usr/share/gnome-software/modulesets.d/popular.xml is in gnome-software-common 3.20.1+git20160420.1.ca63436.ubuntu-xenial-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | <!-- Apps for the "Editor's Picks" list -->
<moduleset name="popular">
<module type="application">bijiben.desktop</module>
<module type="application">calibre-gui.desktop</module>
<module type="application">geary.desktop</module>
<module type="application">gnucash.desktop</module>
<module type="application">gtg.desktop</module>
<module type="application">inkscape.desktop</module>
<module type="application">mozilla-thunderbird.desktop</module>
<module type="application">musique.desktop</module>
<module type="application">org.gnome.Maps.desktop</module>
<module type="application">pdfmod.desktop</module>
<module type="application">scribus.desktop</module>
<module type="application">shutter.desktop</module>
<module type="application">simple-scan.desktop</module>
<module type="application">stellarium.desktop</module>
<module type="application">transmission-gtk.desktop</module>
</moduleset>
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