Remove listener callback

api/client.go

@@ -10,7 +10,6 @@ import (
 	"github.com/pkg/errors"
 	jww "github.com/spf13/jwalterweatherman"
 	"gitlab.com/elixxir/client/interfaces"
-	"gitlab.com/elixxir/client/interfaces/message"
 	"gitlab.com/elixxir/client/interfaces/params"
 	"gitlab.com/elixxir/client/interfaces/user"
 	"gitlab.com/elixxir/client/keyExchange"
@@ -333,13 +332,6 @@ func (c *Client) GetUser() user.User {
 	return c.storage.GetUser()
 }
 
-// RegisterListenerCallback records and installs a listener callback for
-// messages matching specific uid, msgType, and/or username
-func (c *Client) RegisterListenerCallback(uid []byte, msgType int,
-	username string, listenerCb func(msg message.Receive)) {
-
-}
-
 // ----- Utility Functions -----
 // parseNDF parses the initial ndf string for the client. do not check the
 // signature, it is deprecated.