Delete ReportBlock::cumulative_lost_signed accessor

cumulative lost is always signed now.

Bug: webrtc:9598
Change-Id: I7cf9f87c01a60fafc3fa6a9bdb84950343697193
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/301940
Auto-Submit: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39905}
diff --git a/modules/rtp_rtcp/source/rtcp_packet/report_block.h b/modules/rtp_rtcp/source/rtcp_packet/report_block.h
index 6ed4f65..b49219e 100644
--- a/modules/rtp_rtcp/source/rtcp_packet/report_block.h
+++ b/modules/rtp_rtcp/source/rtcp_packet/report_block.h
@@ -49,9 +49,6 @@
 
   uint32_t source_ssrc() const { return source_ssrc_; }
   uint8_t fraction_lost() const { return fraction_lost_; }
-  [[deprecated]] int32_t cumulative_lost_signed() const {
-    return cumulative_lost_;
-  }
   int32_t cumulative_lost() const { return cumulative_lost_; }
   uint32_t extended_high_seq_num() const { return extended_high_seq_num_; }
   uint32_t jitter() const { return jitter_; }
diff --git a/rtc_tools/rtc_event_log_visualizer/main.cc b/rtc_tools/rtc_event_log_visualizer/main.cc
index 4988808..9fdc554 100644
--- a/rtc_tools/rtc_event_log_visualizer/main.cc
+++ b/rtc_tools/rtc_event_log_visualizer/main.cc
@@ -399,7 +399,7 @@
         "Fraction lost (outgoing RTCP)", "Loss rate (percent)", plot);
   });
   auto GetCumulativeLost = [](const webrtc::rtcp::ReportBlock& block) -> float {
-    return block.cumulative_lost_signed();
+    return block.cumulative_lost();
   };
   plots.RegisterPlot("incoming_rtcp_cumulative_lost", [&](Plot* plot) {
     analyzer.CreateSenderAndReceiverReportPlot(