Ubuntu One Rhythmbox integration

Comment 0 for bug 951425

ubuntu@precise:~$ uname -a && lsb_release -a
Linux precise 3.2.0-18-generic-pae #28-Ubuntu SMP Fri Mar 2 22:11:12 UTC 2012 i686 i686 i386 GNU/Linux
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu precise (development branch)
Release: 12.04
Codename: precise

Last RhythmBox release of the official precise repositories

while 1:
   enable Ubuntu One plugin
   disable Ubuntu One plugin

Every time U1 plugin is enabled, a new U1 icon comes in the sidebar.
When disabled, nothing happens.