diff --git a/modules/congestion_controller/goog_cc/delay_based_bwe.cc b/modules/congestion_controller/goog_cc/delay_based_bwe.cc
index 4e127dce0f..4894c9863b 100644
--- a/modules/congestion_controller/goog_cc/delay_based_bwe.cc
+++ b/modules/congestion_controller/goog_cc/delay_based_bwe.cc
@@ -62,8 +62,8 @@ size_t ReadTrendlineFilterWindowSize() {
       return window_size;
     RTC_LOG(WARNING) << "Window size must be greater than 1.";
   }
-  RTC_LOG(LS_WARNING) << "Failed to parse parameters for BweTrendlineFilter "
-                         "experiment from field trial string. Using default.";
+  RTC_LOG(LS_WARNING) << "Failed to parse parameters for BweWindowSizeInPackets"
+                         " experiment from field trial string. Using default.";
   return kDefaultTrendlineWindowSize;
 }
 }  // namespace
diff --git a/sdk/objc/api/peerconnection/RTCFieldTrials.h b/sdk/objc/api/peerconnection/RTCFieldTrials.h
index effc470686..cf648d32c3 100644
--- a/sdk/objc/api/peerconnection/RTCFieldTrials.h
+++ b/sdk/objc/api/peerconnection/RTCFieldTrials.h
@@ -20,24 +20,12 @@ RTC_EXTERN NSString * const kRTCFieldTrialAudioForceABWENoTWCCKey;
 RTC_EXTERN NSString * const kRTCFieldTrialSendSideBweWithOverheadKey;
 RTC_EXTERN NSString * const kRTCFieldTrialFlexFec03AdvertisedKey;
 RTC_EXTERN NSString * const kRTCFieldTrialFlexFec03Key;
-RTC_EXTERN NSString * const kRTCFieldTrialImprovedBitrateEstimateKey;
 RTC_EXTERN NSString * const kRTCFieldTrialH264HighProfileKey;
 RTC_EXTERN NSString * const kRTCFieldTrialMinimizeResamplingOnMobileKey;
 
 /** The valid value for field trials above. */
 RTC_EXTERN NSString * const kRTCFieldTrialEnabledValue;
 
-/** Use a string returned by RTCFieldTrialMedianSlopeFilterValue as the value. */
-RTC_EXTERN NSString * const kRTCFieldTrialMedianSlopeFilterKey;
-RTC_EXTERN NSString *RTCFieldTrialMedianSlopeFilterValue(
-    size_t windowSize, double thresholdGain);
-
-/** Use a string returned by RTCFieldTrialTrendlineFilterValue as the value. */
-RTC_EXTERN NSString * const kRTCFieldTrialTrendlineFilterKey;
-/** Returns a valid value for kRTCFieldTrialTrendlineFilterKey. */
-RTC_EXTERN NSString *RTCFieldTrialTrendlineFilterValue(
-    size_t windowSize, double smoothingCoeff, double thresholdGain);
-
 /** Initialize field trials using a dictionary mapping field trial keys to their
  * values. See above for valid keys and values. Must be called before any other
  * call into WebRTC. See: webrtc/system_wrappers/include/field_trial.h
diff --git a/sdk/objc/api/peerconnection/RTCFieldTrials.mm b/sdk/objc/api/peerconnection/RTCFieldTrials.mm
index 2212c7dec9..127ce6feb8 100644
--- a/sdk/objc/api/peerconnection/RTCFieldTrials.mm
+++ b/sdk/objc/api/peerconnection/RTCFieldTrials.mm
@@ -23,9 +23,6 @@ NSString * const kRTCFieldTrialAudioForceABWENoTWCCKey = @"WebRTC-Audio-ABWENoTW
 NSString * const kRTCFieldTrialSendSideBweWithOverheadKey = @"WebRTC-SendSideBwe-WithOverhead";
 NSString * const kRTCFieldTrialFlexFec03AdvertisedKey = @"WebRTC-FlexFEC-03-Advertised";
 NSString * const kRTCFieldTrialFlexFec03Key = @"WebRTC-FlexFEC-03";
-NSString * const kRTCFieldTrialImprovedBitrateEstimateKey = @"WebRTC-ImprovedBitrateEstimate";
-NSString * const kRTCFieldTrialMedianSlopeFilterKey = @"WebRTC-BweMedianSlopeFilter";
-NSString * const kRTCFieldTrialTrendlineFilterKey = @"WebRTC-BweTrendlineFilter";
 NSString * const kRTCFieldTrialH264HighProfileKey = @"WebRTC-H264HighProfile";
 NSString * const kRTCFieldTrialMinimizeResamplingOnMobileKey =
     @"WebRTC-Audio-MinimizeResamplingOnMobile";
@@ -33,18 +30,6 @@ NSString * const kRTCFieldTrialEnabledValue = @"Enabled";
 
 static std::unique_ptr<char[]> gFieldTrialInitString;
 
-NSString *RTCFieldTrialMedianSlopeFilterValue(
-    size_t windowSize, double thresholdGain) {
-  NSString *format = @"Enabled-%zu,%lf";
-  return [NSString stringWithFormat:format, windowSize, thresholdGain];
-}
-
-NSString *RTCFieldTrialTrendlineFilterValue(
-    size_t windowSize, double smoothingCoeff, double thresholdGain) {
-  NSString *format = @"Enabled-%zu,%lf,%lf";
-  return [NSString stringWithFormat:format, windowSize, smoothingCoeff, thresholdGain];
-}
-
 void RTCInitFieldTrialDictionary(NSDictionary<NSString *, NSString *> *fieldTrials) {
   if (!fieldTrials) {
     RTCLogWarning(@"No fieldTrials provided.");