message: Remove unused functions from RtpRtcp
  Cr-Commit-Position: refs/heads/main@{#38513}
diff: @@ -30,12 +30,6 @@ class RtpRtcp : public RtpRtcpInterface {
  static std::unique_ptr<RtpRtcp> DEPRECATED_Create(
  const Configuration& configuration);
  - // Requests new key frame.
  - // using PLI, https://tools.ietf.org/html/rfc4585#section-6.3.1.1
  - void SendPictureLossIndication() { SendRTCP(kRtcpPli); }
  - // using FIR, https://tools.ietf.org/html/rfc5104#section-4.3.1.2
  - void SendFullIntraRequest() { SendRTCP(kRtcpFir); }
  -
  // Process any pending tasks such as timeouts.
  virtual void Process() = 0;
  };
  