Adapt RTCIceTransport API to new events structure (#15191)
Adapt RTCIceTransport API to new events structure (#15191)

* Adapt RTCIceTransport API to new events structure

This PR adapts the RTCIceTransport API to conform to the new events structure.

* Update statechange event
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data