Cleanup: remove unused test break code for handling cancels.

source/blender/windowmanager/intern/wm_init_exit.c

@@ -224,7 +224,6 @@ void WM_init(bContext *C, int argc, const char **argv)
 	BKE_region_callback_free_gizmomap_set(wm_gizmomap_remove); /* screen.c */
 	BKE_region_callback_refresh_tag_gizmomap_set(WM_gizmomap_tag_refresh);
 	BKE_library_callback_remap_editor_id_reference_set(WM_main_remap_editor_id_reference);   /* library.c */
-	BKE_blender_callback_test_break_set(wm_window_testbreak); /* blender.c */
 	BKE_spacedata_callback_id_remap_set(ED_spacedata_id_remap); /* screen.c */
 	DEG_editors_set_update_cb(ED_render_id_flush_update,
 	                          ED_render_scene_update);