message: Fix AudioProcessing::Config::ToString() implementation.
  residual_echo_detector and level_estimation is not part of gain_controller2
  in AudioProcessing::Config.
  Cr-Commit-Position: refs/heads/master@{#32972}
diff: @@ -172,10 +172,10 @@ std::string AudioProcessing::Config::ToString() const {
  << gain_controller2.adaptive_digital.max_gain_change_db_per_second
  << ", max_output_noise_level_dbfs: "
  << gain_controller2.adaptive_digital.max_output_noise_level_dbfs
  - << " } }, residual_echo_detector: { enabled: "
  + << " }}}, residual_echo_detector: { enabled: "
  << residual_echo_detector.enabled
  << " }, level_estimation: { enabled: " << level_estimation.enabled
  - << " }}}";
  + << " }}";
  return builder.str();
  }
  