Remove redundancies of multiply() in FFTFrame.

Source/platform/audio/FFTFrameStub.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 46 matching lines @@
     , m_log2FFTSize(frame.m_log2FFTSize)
 {
     ASSERT_NOT_REACHED();
 }
 
 FFTFrame::~FFTFrame()
 {
     ASSERT_NOT_REACHED();
 }
 
-void FFTFrame::multiply(const FFTFrame& frame)
-{
-    ASSERT_NOT_REACHED();
-}
-
 void FFTFrame::doFFT(const float* data)
 {
     ASSERT_NOT_REACHED();
 }
 
 void FFTFrame::doInverseFFT(float* data)
 {
     ASSERT_NOT_REACHED();
 }
 
@@ skipping 16 matching lines @@
 {
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 } // namespace WebCore
 
 #endif // !OS(MACOSX) && !USE(WEBAUDIO_FFMPEG) && !USE(WEBAUDIO_IPP) && !USE(WEBAUDIO_OPENMAX_DL_FFT)
 
 #endif // ENABLE(WEB_AUDIO)