Revert of Propagate probing cluster id to SendTimeHistory.

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index b514dd71d0814a677ce96d489dcb819f660b8dcf..6b9de2976e92a5d41095346902181404a2060905 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -75,13 +75,11 @@
   // Implements TransportFeedbackObserver.
   void AddPacket(uint16_t sequence_number,
                  size_t length,
-                 bool was_paced,
-                 int probe_cluster_id) override {
+                 bool was_paced) override {
     RTC_DCHECK(pacer_thread_.CalledOnValidThread());
     rtc::CritScope lock(&crit_);
     if (feedback_observer_)
-      feedback_observer_->AddPacket(sequence_number, length, was_paced,
-                                    probe_cluster_id);
+      feedback_observer_->AddPacket(sequence_number, length, was_paced);
   }
   void OnTransportFeedback(const rtcp::TransportFeedback& feedback) override {
     RTC_DCHECK(network_thread_.CalledOnValidThread());