This CL removes the code for the deprecated legacy noise. Bug: webrtc:5298 Change-Id: If287d8967a3079ef96bff4790afa31f37d178823 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/167922 Reviewed-by: Sam Zackrisson <saza@webrtc.org> Commit-Queue: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30434}