Rename "Audio playout level" to "Audio level" on the Y-axis of the event log graph.

webrtc/tools/event_log_visualizer/analyzer.cc

Index: webrtc/tools/event_log_visualizer/analyzer.cc
diff --git a/webrtc/tools/event_log_visualizer/analyzer.cc b/webrtc/tools/event_log_visualizer/analyzer.cc
index d68ad8124e0460b373a15343328f8c4593fa7478..d9b772bcd6ecd77ce04713de0bf8c95afd3b0b36 100644
--- a/webrtc/tools/event_log_visualizer/analyzer.cc
+++ b/webrtc/tools/event_log_visualizer/analyzer.cc
@@ -645,7 +645,7 @@ void EventLogAnalyzer::CreateAudioLevelGraph(Plot* plot) {
   }
 
   plot->SetXAxis(0, call_duration_s_, "Time (s)", kLeftMargin, kRightMargin);
-  plot->SetYAxis(-127, 0, "Audio playout level (dBov)", kBottomMargin,
+  plot->SetYAxis(-127, 0, "Audio level (dBov)", kBottomMargin,
                  kTopMargin);
   plot->SetTitle("Audio level");
 }