Parse MedianSlopeFilter-parameters to the correct variables.

webrtc/modules/congestion_controller/delay_based_bwe.cc

Index: webrtc/modules/congestion_controller/delay_based_bwe.cc
diff --git a/webrtc/modules/congestion_controller/delay_based_bwe.cc b/webrtc/modules/congestion_controller/delay_based_bwe.cc
index 6338f9646f998db7cd0b77585a949eed06f19d2e..7a20b3eedb4fea1556931d8935c5218591a71a8d 100644
--- a/webrtc/modules/congestion_controller/delay_based_bwe.cc
+++ b/webrtc/modules/congestion_controller/delay_based_bwe.cc
@@ -230,8 +230,8 @@ DelayBasedBwe::DelayBasedBwe(Clock* clock)
                                             &trendline_threshold_gain_);
   }
   if (in_median_slope_experiment_) {
-    ReadMedianSlopeFilterExperimentParameters(&trendline_window_size_,
-                                              &trendline_threshold_gain_);
+    ReadMedianSlopeFilterExperimentParameters(&median_slope_window_size_,
+                                              &median_slope_threshold_gain_);
   }
 
   network_thread_.DetachFromThread();