Removed local getUserMedia conversion code and use the one provided by the adapter, fixing screen sharing for Chrome >= 49.
Removed local getUserMedia conversion code and use the one provided by the adapter, fixing screen sharing for Chrome >= 49.

theurere/spreed-webrtc,strukturag/spreed-webrtc,strukturag/spreed-webrtc,strukturag/spreed-webrtc,theurere/spreed-webrtc,theurere/spreed-webrtc,strukturag/spreed-webrtc,strukturag/spreed-webrtc,strukturag/spreed-webrtc,theurere/spreed-webrtc,theurere/spreed-webrtc,theurere/spreed-webrtc