Removing the package does not remove the entry in messages indicator

I had installed unity-webapps-googleplus and wanted to remove it, which I did using the following command:

sudo apt-get purge unity-webapps-googleplus

It worked but the Google+ entry in messages indicator was not removed. I had to remove it by myself by deleting the file:

~/.local/share/applications/Googleplusgooglecom.desktop

I think removing the package should also remove this file.