message: disallow pairing ICE-TCP with a local ip address
  Cr-Commit-Position: refs/heads/master@{#30457}
diff: @@ -59,6 +59,13 @@ webrtc::RTCError VerifyCandidate(const cricket::Candidate& cand) {
  }
  }
  + // Disallow ICE-TCP with a private IP address.
  + if (cand.protocol() == cricket::TCP_PROTOCOL_NAME &&
  + cand.address().IsPrivateIP()) {
  + return webrtc::RTCError(webrtc::RTCErrorType::INVALID_PARAMETER,
  + "candidate is TCP and has a private IP address");
  + }
  +
  return webrtc::RTCError::OK();
  }
  