Byoungchan Lee d197e0b876 Reland "Don't create PacketSocketFactory inside BasicPortAllocatorSession"
This is a reland of commit 7d4634cef76a1ac244d4b83faaf4c617bf236b71

Original change's description:
> Don't create PacketSocketFactory inside BasicPortAllocatorSession
>
> 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}

Bug: webrtc:13145
Change-Id: Iec8091ada5862cb6aa48d45b2a426c05bda798f9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264826
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Owners-Override: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Christoffer Jansson <jansson@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37138}
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