Removed WithChecker because it doesn't exist anymore

Signed-off-by: Francesco Guardiani <francescoguard@gmail.com>

pkg/kncloudevents/message_receiver.go

@@ -37,8 +37,6 @@ type HTTPMessageReceiver struct {
 
 	server   *http.Server
 	listener net.Listener
-
-	checker http.HandlerFunc
 }
 
 // HTTPMessageReceiverOption enables further configuration of a HTTPMessageReceiver.
@@ -54,16 +52,6 @@ func NewHTTPMessageReceiver(port int, o ...HTTPMessageReceiverOption) *HTTPMessa
 	return h
 }
 
-// WithChecker takes a handler func which will run as an additional health check in Drainer.
-// kncloudevents HTTPMessageReceiver uses Drainer to perform health check.
-// By default, Drainer directly writes StatusOK to kubelet probe if the Pod is not draining.
-// Users can configure customized liveness and readiness check logic by defining checker here.
-func WithChecker(checker http.HandlerFunc) HTTPMessageReceiverOption {
-	return func(h *HTTPMessageReceiver) {
-		h.checker = checker
-	}
-}
-
 // Blocking
 func (recv *HTTPMessageReceiver) StartListen(ctx context.Context, handler http.Handler) error {
 	var err error
@@ -72,8 +60,7 @@ func (recv *HTTPMessageReceiver) StartListen(ctx context.Context, handler http.H
 	}
 
 	drainer := &handlers.Drainer{
-		Inner:       CreateHandler(handler),
-		HealthCheck: recv.checker,
+		Inner: CreateHandler(handler),
 	}
 	recv.server = &http.Server{
 		Addr:    recv.listener.Addr().String(),