GainController2: Remove the unused method Initialize

Bug: webrtc:7494
Change-Id: I46a808116abefc6d7d2dd3b954fc1fba7d6f8a90
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/280040
Commit-Queue: Hanna Silen <silen@webrtc.org>
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38455}

modules/audio_processing/gain_controller2.cc

diff --git a/modules/audio_processing/gain_controller2.cc b/modules/audio_processing/gain_controller2.cc
index aebac52..ecc286e 100644
--- a/modules/audio_processing/gain_controller2.cc
+++ b/modules/audio_processing/gain_controller2.cc
@@ -95,23 +95,6 @@
 
 GainController2::~GainController2() = default;
 
-void GainController2::Initialize(int sample_rate_hz, int num_channels) {
-  RTC_DCHECK(sample_rate_hz == AudioProcessing::kSampleRate8kHz ||
-             sample_rate_hz == AudioProcessing::kSampleRate16kHz ||
-             sample_rate_hz == AudioProcessing::kSampleRate32kHz ||
-             sample_rate_hz == AudioProcessing::kSampleRate48kHz);
-  // TODO(bugs.webrtc.org/7494): Initialize `fixed_gain_applier_`.
-  limiter_.SetSampleRate(sample_rate_hz);
-  if (vad_) {
-    vad_->Initialize(sample_rate_hz);
-  }
-  if (adaptive_digital_controller_) {
-    adaptive_digital_controller_->Initialize(sample_rate_hz, num_channels);
-  }
-  data_dumper_.InitiateNewSetOfRecordings();
-  calls_since_last_limiter_log_ = 0;
-}
-
 void GainController2::SetFixedGainDb(float gain_db) {
   const float gain_factor = DbToRatio(gain_db);
   if (fixed_gain_applier_.GetGainFactor() != gain_factor) {

modules/audio_processing/gain_controller2.h

diff --git a/modules/audio_processing/gain_controller2.h b/modules/audio_processing/gain_controller2.h
index ec3816f..843917a 100644
--- a/modules/audio_processing/gain_controller2.h
+++ b/modules/audio_processing/gain_controller2.h
@@ -41,9 +41,6 @@
   GainController2& operator=(const GainController2&) = delete;
   ~GainController2();
 
-  // Detects and handles changes of sample rate and/or number of channels.
-  void Initialize(int sample_rate_hz, int num_channels);
-
   // Sets the fixed digital gain.
   void SetFixedGainDb(float gain_db);