Declines an invitation to join a specific chat channel.
- String - name of the channel the player was invited to but does not wish to join.
- CHANNEL_INVITE_REQUEST fires when the player has been invited to a chat channel.
- There is no equivalent Accept function; FrameXML merely calls JoinPermanentChannel when the invitation is accepted.
Patch 5.2.0 (2013-03-05): Added.