Prevent a MediaStream to remain registered as a self observer on errors

Ignore-this: 19a20424961aab9a5cff105bfcd05b68

darcs-hash:20100210183035-b22ec-8db9d10c8ed0c8281cde51723a1b9f4d0f57f32c
Use regular nomination in ICE instead of aggressive

Ignore-this: 7df6daf9d0fe971dfc1ac914e0909ab3

darcs-hash:20100210163629-56b4d-a93648e882afcdd5766899a65fa621146acc6de5