Add algorithm for Residual Echo Detector.

webrtc/modules/audio_processing/residual_echo_detector.h

Index: webrtc/modules/audio_processing/residual_echo_detector.h
diff --git a/webrtc/modules/audio_processing/residual_echo_detector.h b/webrtc/modules/audio_processing/residual_echo_detector.h
index ec9515bf0a5eb873ec07089605705d7991f1e480..d97ae7618f7b1998905054a16b2377805438d653 100644
--- a/webrtc/modules/audio_processing/residual_echo_detector.h
+++ b/webrtc/modules/audio_processing/residual_echo_detector.h
@@ -38,7 +38,7 @@ class ResidualEchoDetector {
   void AnalyzeCaptureAudio(const AudioBuffer* audio);
 
   // This function should be called while holding the capture lock.
-  void Initialize(int sample_rate_hz);
+  void Initialize();
 
   // Reads render side data that has been queued on the render call.
   // This function should be called while holding the capture lock.