The code was doing nothing except for triggering thread sanitizer, since concurrent writes weren't guarded: * ReadRecordedData() through webrtc_audio_module_rec_thread * InitPlayout() through main thread Bug: webrtc:9751 Change-Id: I7ecf4fa436ff0695e5b998d7e3f159fb6c7e9214 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/146216 Reviewed-by: Henrik Andreassson <henrika@webrtc.org> Commit-Queue: Yves Gerey <yvesg@google.com> Cr-Commit-Position: refs/heads/master@{#28636}