Don't append the bitrate twice to the outgoing bitrate plot in event_log_visualizer.

rtc_tools/event_log_visualizer/analyzer.cc

Index: rtc_tools/event_log_visualizer/analyzer.cc
diff --git a/rtc_tools/event_log_visualizer/analyzer.cc b/rtc_tools/event_log_visualizer/analyzer.cc
index bd8cb99c1b755774b1c882f18e4358a3e4b99bdf..52c2dc9d7077bc035171ae7ff7634a8d4e16b38f 100644
--- a/rtc_tools/event_log_visualizer/analyzer.cc
+++ b/rtc_tools/event_log_visualizer/analyzer.cc
@@ -1030,7 +1030,6 @@ void EventLogAnalyzer::CreateTotalBitrateGraph(
       plot->AppendIntervalSeries(std::move(normal_series));
     }
 
-    plot->AppendTimeSeries(std::move(bitrate_series));
     plot->AppendTimeSeries(std::move(loss_series));
     plot->AppendTimeSeries(std::move(delay_series));
     plot->AppendTimeSeries(std::move(created_series));