Allow enabling WebSockets from Labs Preferences

Change-Id: Ia0dc06cbd4f2e8e340a8f8ee910a6310a5079d79

labs: websockets: fix typo in preference key
Change-Id: I7b32b9a8148e56103b683ed60f8314075d59e5a2

Change-Id: Ia0dc06cbd4f2e8e340a8f8ee910a6310a5079d79