Following [1], add many more checks for safe access to member variables.
This change is effectively a no-op, but landed separately from the
earlier change that's smaller but contains a fundamental assumption
gleaned from the implementation (and its use).
[1]: https://webrtc-review.googlesource.com/c/src/+/249942
Bug: webrtc:11988
Change-Id: I1568e2160c9faa6993c5b68044312f83d00e4815
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249943
Auto-Submit: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35850}
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