Revert "Enable controller to have CORS"

This reverts commit f39ac24e99.

pkg/controller/router.go

@@ -21,7 +21,6 @@ import (
 
 	router "github.com/gorilla/mux"
 	"github.com/minio/minio/pkg/rpc"
-	"github.com/rs/cors"
 )
 
 // getRPCHandler rpc handler
@@ -40,5 +39,5 @@ func getRPCHandler() http.Handler {
 // registerRPC - register rpc handlers
 func registerRPC(mux *router.Router, s *rpc.Server) http.Handler {
 	mux.Handle("/rpc", s)
-	return cors.Default().Handler(mux)
+	return mux
 }