Remove the usage of the field-trial WebRTC-Aec3AecStateFullResetKillSwitch

Bug: webrtc:42233815
Change-Id: Iaa470fc0b0877198091b1620480f347fa137c703
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/465584
Commit-Queue: Per Åhgren <peah@webrtc.org>
Reviewed-by: Jesus de Vicente Pena <devicentepena@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47520}

modules/audio_processing/aec3/aec_state.cc

diff --git a/modules/audio_processing/aec3/aec_state.cc b/modules/audio_processing/aec3/aec_state.cc
index d97fda3..4c25a58 100644
--- a/modules/audio_processing/aec3/aec_state.cc
+++ b/modules/audio_processing/aec3/aec_state.cc
@@ -44,10 +44,6 @@
       "WebRTC-Aec3DeactivateInitialStateResetKillSwitch");
 }
 
-bool FullResetAtEchoPathChange(const FieldTrialsView& field_trials) {
-  return !field_trials.IsEnabled("WebRTC-Aec3AecStateFullResetKillSwitch");
-}
-
 bool SubtractorAnalyzerResetAtEchoPathChange(
     const FieldTrialsView& field_trials) {
   return !field_trials.IsEnabled(
@@ -133,8 +129,6 @@
       num_capture_channels_(num_capture_channels),
       deactivate_initial_state_reset_at_echo_path_change_(
           DeactivateInitialStateResetAtEchoPathChange(env.field_trials())),
-      full_reset_at_echo_path_change_(
-          FullResetAtEchoPathChange(env.field_trials())),
       subtractor_analyzer_reset_at_echo_path_change_(
           SubtractorAnalyzerResetAtEchoPathChange(env.field_trials())),
       initial_state_(config_),
@@ -175,9 +169,8 @@
   // TODO(peah): Refine the reset scheme according to the type of gain and
   // delay adjustment.
 
-  if (full_reset_at_echo_path_change_ &&
-      echo_path_variability.delay_change !=
-          EchoPathVariability::DelayAdjustment::kNone) {
+  if (echo_path_variability.delay_change !=
+      EchoPathVariability::DelayAdjustment::kNone) {
     full_reset();
   } else if (echo_path_variability.gain_change) {
     erle_estimator_.Reset(false);

modules/audio_processing/aec3/aec_state.h

diff --git a/modules/audio_processing/aec3/aec_state.h b/modules/audio_processing/aec3/aec_state.h
index df5bc65..26bd2ee 100644
--- a/modules/audio_processing/aec3/aec_state.h
+++ b/modules/audio_processing/aec3/aec_state.h
@@ -167,7 +167,6 @@
   const EchoCanceller3Config config_;
   const size_t num_capture_channels_;
   const bool deactivate_initial_state_reset_at_echo_path_change_;
-  const bool full_reset_at_echo_path_change_;
   const bool subtractor_analyzer_reset_at_echo_path_change_;
 
   // Class for controlling the transition from the intial state, which in turn