The owner of the memory must free it when the time is right, don‘t assume raw_ptr<T> will free it for you (it won’t). Unlike std::unique_ptr<T>, base::scoped_refptr<T>, etc., it does not manage ownership or lifetime of an allocated object.
if the pointer is the owner of the memory, consider using an alternative smart pointer.

Так я не понял, а почему они просто std::unique_ptr и прочие smart указатели из стандартной библиотеки не используют.