Under the combined network/worker thread project, tasks are unnecessarily posted to the same thread. Avoid this by posting only if invoked on a diffferent sequence. TESTED=presubmit + local Meet calls. Bug: webrtc:137439 Change-Id: Ic5dd99e5fbb843ad4c54d4466138135ae81596cf Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/295867 Commit-Queue: Markus Handell <handellm@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39471}