Tomas Gunnarsson 1e75df26e3 Remove lock from UlpfecReceiverImpl and replace with a sequence checker.
Also making some more state const.

Instances of this class are currently constructed and used on the
"worker thread" but as part of the work for bug webrtc:11993, the
instances will be moved over to the network thread. Since the
class as is does not require synchronization, that is a good property
to make explicit now and then make sure we maintain it in the
transition.

Bug: webrtc:11993
Change-Id: Id587a746ce0a4363b9e9871ae1749549f8ef3e24
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/202681
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33035}
2021-01-19 14:20:40 +00:00
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