The PseudoTcp test class is being used outside of WebRTC in ways that WebRTC itself doesn't, which caused this revert: https://webrtc-review.googlesource.com/c/src/+/186564 As it happens though, PseudoTcp doesn't actually use the StreamInterface part of FifoBuffer, so this CL cuts the dependency from PseudoTcp on FifoBuffer. Moving forward, we could just remove this class from WebRTC. Bug: webrtc:11988 Change-Id: Id34a2a6305e8fe37d705ba5e8876dd6398515125 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/186665 Commit-Queue: Tommi <tommi@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32309}