With GNOME 3.0 (april 2011), the GNOME Project decided to discontinue GConf.
It won't be maintained anymore: bugs and security holes will not be fixed.
Thus, spotify shouldn't depend on GConf any longer.
Please, migrate to GSettings.
GStettings is the official GNOME replacement for GConf, and the GNOME project
is porting all of its applications to it:
You will find the official from GConf to GSettings porting guide at: