Event log visualizer TimeSeries is now created on the stack and then moved into the vector of serie…

webrtc/tools/event_log_visualizer/plot_base.cc

Index: webrtc/tools/event_log_visualizer/plot_base.cc
diff --git a/webrtc/tools/event_log_visualizer/plot_base.cc b/webrtc/tools/event_log_visualizer/plot_base.cc
index baee3dfeee3cd0708bd8e490a791b0560802fa33..057a3108a4c7fc9f090837d29765b0bef58ecf2b 100644
--- a/webrtc/tools/event_log_visualizer/plot_base.cc
+++ b/webrtc/tools/event_log_visualizer/plot_base.cc
@@ -71,14 +71,8 @@ void Plot::SetTitle(std::string title) {
   title_ = title;
 }
 
-TimeSeries* Plot::AddTimeSeries(const char* label, PlotStyle style) {
-  series_list_.emplace_back(label, style);
-  return &series_list_.back();
-}
-
-TimeSeries* Plot::AddTimeSeries(const std::string& label, PlotStyle style) {
-  series_list_.emplace_back(label, style);
-  return &series_list_.back();
+void Plot::AppendTimeSeries(TimeSeries&& time_series) {
+  series_list_.emplace_back(std::move(time_series));
 }
 
 }  // namespace plotting