remove redundant code

pkg/controller/certificates/certificate_controller.go

@@ -57,7 +57,7 @@ func NewCertificateController(
 	// Send events to the apiserver
 	eventBroadcaster := record.NewBroadcaster()
 	eventBroadcaster.StartLogging(glog.Infof)
-	eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: v1core.New(kubeClient.Core().RESTClient()).Events("")})
+	eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: v1core.New(kubeClient.CoreV1().RESTClient()).Events("")})
 
 	cc := &CertificateController{
 		kubeClient: kubeClient,
@@ -97,7 +97,6 @@ func NewCertificateController(
 	})
 	cc.csrLister = csrInformer.Lister()
 	cc.csrsSynced = csrInformer.Informer().HasSynced
-	cc.handler = handler
 	return cc
 }