LPS-40873 isUserAvailableForChatVideo() -> isUserAvailable()
LPS-40873 New line after `var instance = this;`
LPS-40873 Use A.Lang.isUndefined() instead of typeof
LPS-40873 .get('checked') -> .attr('checked')
LPS-40873 Simplify Liferay.Chat.VideoManager.isUserAvailable()
LPS-40873 Use appropriate .each() callback signature
LPS-40873 uid -> userId
LPS-40873 node.getAttribute() -> node.attr()