Minor fix of creating WebRTC conference instance in chat.js.
Minor fix of creating WebRTC conference instance in chat.js.

EGreg/Platform,AndreyTepaykin/Platform,AndreyTepaykin/Platform,AndreyTepaykin/Platform,Qbix/Platform,AndreyTepaykin/Platform,Qbix/Platform,EGreg/Platform,EGreg/Platform,Qbix/Platform,Qbix/Platform,EGreg/Platform