To remove histogram WebRTC.PeerConnection.IceRestartState expired in
M77, this CL removes the supporting codebase for it.
The removal of the histogram itself will be performed in crrev.com/c/5131874.
This CL is a part of Chrome Code Health Rotation project.
Bug: chromium:1507998
Change-Id: I0451b6fbe2ae46a9c9d9be7c0302f7f01117af97
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/331881
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Taiyo Mizuhashi <taiyo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#41429}
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