Cleanup: remove dead code

source/blender/editors/object/object_bake_simulation.cc

@@ -86,8 +86,6 @@ static void calculate_simulation_job_startjob(void *customdata,
                                               bool *do_update,
                                               float *progress)
 {
-  using namespace bke::sim;
-
   CalculateSimulationJob &job = *static_cast<CalculateSimulationJob *>(customdata);
   G.is_rendering = true;
   G.is_break = false;
@@ -253,8 +251,6 @@ static void bake_simulation_job_startjob(void *customdata,
                                          bool *do_update,
                                          float *progress)
 {
-  using namespace bke::sim;
-
   BakeSimulationJob &job = *static_cast<BakeSimulationJob *>(customdata);
   G.is_rendering = true;
   G.is_break = false;

source/blender/makesdna/DNA_modifier_types.h

@@ -15,9 +15,6 @@
 #include "DNA_session_uuid_types.h"
 
 #ifdef __cplusplus
-namespace blender::bke::sim {
-struct ModifierSimulationCachePtr;
-}
 namespace blender {
 struct NodesModifierRuntime;
 }