Also fix one instance where access was done wrongly. This makes certain that the split between MediaChannel types is respected for this variable (prior to splitting the actual C++ types). Bug: webrtc:13931 Change-Id: I8cf48ff5eddef35fda75533bb9c5075083c4ab16 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/305220 Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40065}