Remove the usage of the field-trial WebRTC-Aec3TransparentModeKillSwitch

Bug: webrtc:42233815
Change-Id: I689103daa66658dc9000c67d145b991127409432
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/465802
Reviewed-by: Jesus de Vicente Pena <devicentepena@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47524}

modules/audio_processing/aec3/transparent_mode.cc

diff --git a/modules/audio_processing/aec3/transparent_mode.cc b/modules/audio_processing/aec3/transparent_mode.cc
index 196cb7e..84316ac 100644
--- a/modules/audio_processing/aec3/transparent_mode.cc
+++ b/modules/audio_processing/aec3/transparent_mode.cc
@@ -27,10 +27,6 @@
 constexpr size_t kBlocksSinceConsistentEstimateInit = 10000;
 constexpr float kInitialTransparentStateProbability = 0.2f;
 
-bool DeactivateTransparentMode(const FieldTrialsView& field_trials) {
-  return field_trials.IsEnabled("WebRTC-Aec3TransparentModeKillSwitch");
-}
-
 bool ActivateTransparentModeHmm(const FieldTrialsView& field_trials) {
   return field_trials.IsEnabled("WebRTC-Aec3TransparentModeHmm");
 }
@@ -236,8 +232,7 @@
 std::unique_ptr<TransparentMode> TransparentMode::Create(
     const Environment& env,
     const EchoCanceller3Config& config) {
-  if (config.ep_strength.bounded_erl ||
-      DeactivateTransparentMode(env.field_trials())) {
+  if (config.ep_strength.bounded_erl) {
     RTC_LOG(LS_INFO) << "AEC3 Transparent Mode: Disabled";
     return nullptr;
   }