Do not report quality limited resolution stats when quality scaler is disabled.

webrtc/video/send_statistics_proxy.h

Index: webrtc/video/send_statistics_proxy.h
diff --git a/webrtc/video/send_statistics_proxy.h b/webrtc/video/send_statistics_proxy.h
index 37db3b0a09307f9a0d8d825fb7d13ca9988fbea0..5e45bf5e7a372afcde2bd01bfd93dc056ef96663 100644
--- a/webrtc/video/send_statistics_proxy.h
+++ b/webrtc/video/send_statistics_proxy.h
@@ -59,9 +59,8 @@ class SendStatisticsProxy : public CpuOveruseMetricsObserver,
 
   void OnCpuRestrictedResolutionChanged(bool cpu_restricted_resolution);
   void OnQualityRestrictedResolutionChanged(int num_quality_downscales);
-  void SetResolutionRestrictionStats(bool scaling_enabled,
-                                     bool cpu_restricted,
-                                     int num_quality_downscales);
+  void SetCpuScalingStats(bool cpu_restricted_resolution);
+  void SetQualityScalingStats(int num_quality_downscales);  // -1: disabled.
 
   void OnEncoderStatsUpdate(uint32_t framerate, uint32_t bitrate);
   void OnSuspendChange(bool is_suspended);