message: Remove check following SetChannel.
  The number of invokes will vary based on number of receivers/senders,
  so we can't have a fixed number there.
  Cr-Commit-Position: refs/heads/master@{#34027}
diff: @@ -4609,7 +4609,6 @@ void SdpOfferAnswerHandler::DestroyTransceiverChannel(
  // un-set the channel pointer and uninitialize/destruct the channel object
  // at the same time, rather than in separate steps.
  transceiver->internal()->SetChannel(nullptr);
  - RTC_DCHECK_BLOCK_COUNT_NO_MORE_THAN(3);
  // TODO(tommi): All channel objects end up getting deleted on the
  // worker thread (ideally should be on the network thread but the
  // MediaChannel objects are tied to the worker. Can the teardown be done
  