message: MonoInputVolumeController: Refactor Process()
  Cr-Commit-Position: refs/heads/main@{#38549}
diff: @@ -197,19 +197,9 @@ void MonoInputVolumeController::Process(
  CheckVolumeAndReset();
  }
  - int rms_error = 0;
  - bool update_gain = false;
  - if (rms_error_override.has_value()) {
  - if (is_first_frame_ || frames_since_update_gain_ < kOverrideWaitFrames) {
  - update_gain = false;
  - } else {
  - rms_error = *rms_error_override;
  - update_gain = true;
  - }
  - }
  -
  - if (update_gain) {
  - UpdateGain(rms_error);
  + if (rms_error_override.has_value() && !is_first_frame_ &&
  + frames_since_update_gain_ >= kOverrideWaitFrames) {
  + UpdateGain(*rms_error_override);
  }
  is_first_frame_ = false;
  