This extends AlwaysValidPointer to avoid creating a unique_ptr inside it.
Bug: webrtc:13145
Change-Id: I73a4f18d0a7037b57f575b04b134e4f7eadceb79
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/263240
Reviewed-by: Jonas Oreland <jonaso@webrtc.org>
Commit-Queue: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37048}