Cleanup: remove unused code

source/blender/blenkernel/BKE_simulation_state_serialize.hh

@@ -13,15 +13,8 @@ struct Main;
 struct ModifierData;
 struct Object;
 
-namespace blender {
-class fstream;
-}
-
 namespace blender::bke::sim {
 
-using DictionaryValue = io::serialize::DictionaryValue;
-using DictionaryValuePtr = std::shared_ptr<DictionaryValue>;
-
 /**
  * Get the directory that contains all baked simulation data for the given modifier.
  */
@@ -29,6 +22,4 @@ std::string get_default_modifier_bake_directory(const Main &bmain,
                                                 const Object &object,
                                                 const ModifierData &md);
 
-constexpr int simulation_file_storage_version = 3;
-
 }  // namespace blender::bke::sim