message: Remove deprecated webrtc::AudioProcessing::ResidualEchoDetector stats config
  Replaced by injectable component, see discussion and PSA in attached bug.
  Cr-Commit-Position: refs/heads/main@{#36612}
diff: @@ -369,12 +369,6 @@ class RTC_EXPORT AudioProcessing : public rtc::RefCountInterface {
  } adaptive_digital;
  } gain_controller2;
  - // TODO(bugs.webrtc.org/11539): Deprecated. Delete this flag. Replaced by
  - // injectable submodule.
  - struct ResidualEchoDetector {
  - bool enabled = false;
  - } residual_echo_detector;
  -
  std::string ToString() const;
  };
  