* Switch to StunRequest where ConnectionRequest isn't needed. * Move ConnectionRequest into Connection as a subclass * Move declaration+implementation into the .cc file. Bug: none Change-Id: I1591a91d8e13a0db9f89cfbba0fbc9478a55b789 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264150 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37036}