/usr/share/app-install/desktop/unity-webapps-googleplus:GooglePlusplusgooglecom.desktop is in app-install-data 15.10.
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 | [Desktop Entry]
X-AppInstall-Package=unity-webapps-googleplus
X-AppInstall-Popcon=0
X-AppInstall-Section=universe
Name=GooglePlus
Type=Application
Icon=unity-webapps-google-plus
MimeType=
Actions=S0;S1;S2;S3;S4;S5;S6;S7;S8;S9;S10;
Exec=unity-webapps-runner -n 'R29vZ2xlUGx1cw==' -d 'plus.google.com' --store-session-cookies %u
StartupWMClass=GooglePlusplusgooglecom
X-Ubuntu-Gettext-Domain=app-install-data
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