PacedSender::probing_send_failure_ and PacedSender::packet_counter_ should probably also be protected by the critical section. (This isn't the cause of webrtc:8331.) TBR=stefan@webrtc.org Bug: webrtc:8331 Change-Id: I94ebe77341137aa511c736d18a63e3e8ec0d1bac Reviewed-on: https://webrtc-review.googlesource.com/12220 Commit-Queue: Elad Alon <eladalon@webrtc.org> Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20324}