Revert of Compute tail time from Biquad coefficients

third_party/WebKit/Source/modules/webaudio/BiquadDSPKernel.h

Index: third_party/WebKit/Source/modules/webaudio/BiquadDSPKernel.h
diff --git a/third_party/WebKit/Source/modules/webaudio/BiquadDSPKernel.h b/third_party/WebKit/Source/modules/webaudio/BiquadDSPKernel.h
index 99069efa4eb1d4148829a16423f735366db1edd1..efeb3eb027572dabb1bc7e0171297ad860dbce1a 100644
--- a/third_party/WebKit/Source/modules/webaudio/BiquadDSPKernel.h
+++ b/third_party/WebKit/Source/modules/webaudio/BiquadDSPKernel.h
@@ -75,15 +75,8 @@
                           const float* detune);
 
  private:
-  // Compute the tail time using the BiquadFilter coefficients at
-  // index |coef_index|.
-  void UpdateTailTime(int coef_index);
-
   // Synchronize process() with getting and setting the filter coefficients.
   mutable Mutex process_lock_;
-
-  // The current tail time for biquad filter.
-  double tail_time_;
 };
 
 }  // namespace blink