webrtcsrc: Don't hold the state lock while removing sessions
Removing a session can drop its bin and during release of the bin its pads are removed, but the pad-removed handler is also taking the state lock.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Removing a session can drop its bin and during release of the bin its pads are removed, but the pad-removed handler is also taking the state lock.