The WebSocket API has been rev'd to the latest version (13) in Chrome Canary. The developer-facing changes are very small, but are incompatible with the older version.
Here's the scoop:
Sec-WebSocket-Origin -> Origin
Sec-WebSocket-Version header value: 8 -> 13
⟪ Keeping up with HTML5 and browser support Let Your Content Do the Talking: Fullscreen API ⟫