Rename parsing function in AimdRateControl

Bug: None
Change-Id: I59e54cb4ec87c5d31eb8b14813766f1d1e2a95c4
Reviewed-on: https://webrtc-review.googlesource.com/77240
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23386}

modules/remote_bitrate_estimator/aimd_rate_control.cc

diff --git a/modules/remote_bitrate_estimator/aimd_rate_control.cc b/modules/remote_bitrate_estimator/aimd_rate_control.cc
index c494f50..19bfbb9 100644
--- a/modules/remote_bitrate_estimator/aimd_rate_control.cc
+++ b/modules/remote_bitrate_estimator/aimd_rate_control.cc
@@ -34,7 +34,7 @@
 
 const char kBweBackOffFactorExperiment[] = "WebRTC-BweBackOffFactor";
 
-float ReadTrendlineFilterWindowSize() {
+float ReadBackoffFactor() {
   std::string experiment_string =
       webrtc::field_trial::FindFullName(kBweBackOffFactorExperiment);
   float backoff_factor;
@@ -66,7 +66,7 @@
       time_first_incoming_estimate_(-1),
       bitrate_is_initialized_(false),
       beta_(webrtc::field_trial::IsEnabled(kBweBackOffFactorExperiment)
-                ? ReadTrendlineFilterWindowSize()
+                ? ReadBackoffFactor()
                 : kDefaultBackoffFactor),
       rtt_(kDefaultRttMs),
       in_experiment_(!AdaptiveThresholdExperimentIsDisabled()),