Probing: Add support for exponential startup probing

webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter.cc

Index: webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter.cc b/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter.cc
index 94ea9dd395d68d2fd473829379f6b2e365999a45..7c71699791b8310f504e8eecb49feb32f06d433c 100644
--- a/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter.cc
+++ b/webrtc/modules/remote_bitrate_estimator/transport_feedback_adapter.cc
@@ -39,10 +39,8 @@ class PacketInfoComparator {
 };
 
 TransportFeedbackAdapter::TransportFeedbackAdapter(
-    BitrateController* bitrate_controller,
     Clock* clock)
     : send_time_history_(clock, kSendTimeHistoryWindowMs),
-      bitrate_controller_(bitrate_controller),
       clock_(clock),
       current_offset_ms_(kNoTimestamp),
       last_timestamp_us_(kNoTimestamp) {}
@@ -136,12 +134,6 @@ void TransportFeedbackAdapter::OnTransportFeedback(
   bitrate_estimator_->IncomingPacketFeedbackVector(packet_feedback_vector);
 }
 
-void TransportFeedbackAdapter::OnReceiveBitrateChanged(
-    const std::vector<uint32_t>& ssrcs,
-    uint32_t bitrate) {
-  bitrate_controller_->UpdateDelayBasedEstimate(bitrate);
-}
-
 void TransportFeedbackAdapter::OnRttUpdate(int64_t avg_rtt_ms,
                                            int64_t max_rtt_ms) {
   RTC_DCHECK(bitrate_estimator_.get() != nullptr);