While working on MDL-72656, I found out that there are a few methods in course/renderer.php that should be deprecated properly:

• course_category_tree() and course_category_tree_category() need to replace the debugging for an exception and also remove the parameters.
• render_modchooser() must be deprecated because it's not used anymore (it was replaced a long time ago by course_activitychooser() but this method wasn't deprecated. The mustache core_course/modchooser can be deprecated too.