Update RateStatistics to handle too-little-data case.

webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h

Index: webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
diff --git a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
index 93ae2190d61ca73784594ae4c34b1ed249fdddf5..3ac80752b43c26ce67688758d02db1f39b8353e5 100644
--- a/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
+++ b/webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h
@@ -67,7 +67,6 @@ class AimdRateControl {
   uint32_t min_configured_bitrate_bps_;
   uint32_t max_configured_bitrate_bps_;
   uint32_t current_bitrate_bps_;
-  uint32_t max_hold_rate_bps_;
   float avg_max_bitrate_kbps_;
   float var_max_bitrate_kbps_;
   RateControlState rate_control_state_;