Improve computational performance of BWE by switching list to deque.

webrtc/modules/congestion_controller/trendline_estimator.cc

Index: webrtc/modules/congestion_controller/trendline_estimator.cc
diff --git a/webrtc/modules/congestion_controller/trendline_estimator.cc b/webrtc/modules/congestion_controller/trendline_estimator.cc
index ad05a64e1e0262c480d202331d91f5a3cc0ba9d5..6edcd8182d78e374650dd1f100a12e398f022f81 100644
--- a/webrtc/modules/congestion_controller/trendline_estimator.cc
+++ b/webrtc/modules/congestion_controller/trendline_estimator.cc
@@ -20,7 +20,7 @@ namespace webrtc {
 
 namespace {
 rtc::Optional<double> LinearFitSlope(
-    const std::list<std::pair<double, double>> points) {
+    const std::deque<std::pair<double, double>>& points) {
   RTC_DCHECK(points.size() >= 2);
   // Compute the "center of mass".
   double sum_x = 0;