Tomas Gunnarsson 97a387d7f3 Make PeerConnection::session_id_ const and readable from any thread.
Going forward, we'll need to read this value from other threads than
signaling, so I've moved the initialization into the constructor.

Bug: none
Change-Id: I56b00d38c86788cbab9a2055719074ea48f4750f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/213185
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33613}
2021-04-01 16:44:48 +00:00
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