Earlier, it was NavMeshBuilder, but with version 5.5 there is no such a class.
How can I bake NavMesh in code in editor mode ?
EDIT 1
I do not want to bake navmesh at runtime. All I want to do is bake navMesh in editor mode(NOT PLAY MODE) BY THE MY CODE AND NOT BY THE NAVIGATION TAB. Is it still possible ? Just call method that builds nav mesh.