This allows constructing TestAudioDeviceModule on a different thread
than the worker thread and avoids unnecessary invoke. Before,
thread->Start() would fail in a thread check.
Bug: b/79961243
Change-Id: I5c55d8feada2b0ae12bc121f3f795e76a8d04059
Reviewed-on: https://webrtc-review.googlesource.com/82941
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23574}