message: Add TODO to change AbstractTensorHandlePtr.
diff: @@ -58,6 +58,7 @@ struct AbstractTensorHandleDeleter {
  };
  } // namespace internal
  +// TODO(b/185908092): Make AbstractTensorHandlePtr an IntrusivePtr.
  using AbstractTensorHandlePtr =
  std::unique_ptr<AbstractTensorHandle,
  internal::AbstractTensorHandleDeleter>;
  