Remove deprecated deregistration functions in RtcpTransceiver

These functions were deprecated in
https://webrtc-review.googlesource.com/c/src/+/107305

Bug: None
Change-Id: I3246f1e2f16be7591daec520e90c6b75071eb92d
Reviewed-on: https://webrtc-review.googlesource.com/c/107730
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25388}

modules/rtp_rtcp/source/rtcp_transceiver.h

@@ -19,7 +19,6 @@
 #include "modules/rtp_rtcp/source/rtcp_transceiver_config.h"
 #include "modules/rtp_rtcp/source/rtcp_transceiver_impl.h"
 #include "rtc_base/copyonwritebuffer.h"
-#include "rtc_base/deprecation.h"
 #include "rtc_base/task_queue.h"
 
 namespace webrtc {
@@ -44,8 +43,6 @@ class RtcpTransceiver : public RtcpFeedbackSenderInterface {
   // Note that interfaces provided in constructor or registered with AddObserver
   // still might be used by the transceiver on the task queue
   // until |on_destroyed| runs.
-  RTC_DEPRECATED
-  void Stop(std::unique_ptr<rtc::QueuedTask> on_destroyed);
   void Stop(std::function<void()> on_destroyed);
 
   // Registers observer to be notified about incoming rtcp packets.
@@ -54,11 +51,6 @@ class RtcpTransceiver : public RtcpFeedbackSenderInterface {
                                     MediaReceiverRtcpObserver* observer);
   // Deregisters the observer. Might return before observer is deregistered.
   // Runs |on_removed| when observer is deregistered.
-  RTC_DEPRECATED
-  void RemoveMediaReceiverRtcpObserver(
-      uint32_t remote_ssrc,
-      MediaReceiverRtcpObserver* observer,
-      std::unique_ptr<rtc::QueuedTask> on_removed);
   void RemoveMediaReceiverRtcpObserver(uint32_t remote_ssrc,
                                        MediaReceiverRtcpObserver* observer,
                                        std::function<void()> on_removed);