it is not required because during construction members can be set on wrong thread, and in some corner cases it may even cause a crash. Bug: none Change-Id: I37d7f2a7772b6ab5e574077d3f53bca2529f9ae1 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/222651 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34315}