In [1], a context object was added to websocket requests to subscribe to guests channels on cors live chats. However, the common mechanism to subscribe to record channels is to pass a string channel that will then be validated by the `_subscribe` method of `ir_websocket`. This approach works with OdooSH out of the box while the other one does not. This PR removes the mechanism introduce in [1] in favor of the string approach. [1]: https://github.com/odoo/odoo/pull/130052 closes odoo/odoo#147114 Signed-off-by: Matthieu Stockbauer (tsm) <tsm@odoo.com>