Remove redundancies of multiply() in FFTFrame.

Source/platform/audio/ffmpeg/FFTFrameFFMPEG.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 89 matching lines @@
 void FFTFrame::cleanup()
 {
 }
 
 FFTFrame::~FFTFrame()
 {
     av_rdft_end(m_forwardContext);
     av_rdft_end(m_inverseContext);
 }
 
-void FFTFrame::multiply(const FFTFrame& frame)
-{
-    FFTFrame& frame1 = *this;
-    FFTFrame& frame2 = const_cast<FFTFrame&>(frame);
-
-    float* realP1 = frame1.realData();
-    float* imagP1 = frame1.imagData();
-    const float* realP2 = frame2.realData();
-    const float* imagP2 = frame2.imagData();
-
-    unsigned halfSize = fftSize() / 2;
-    float real0 = realP1[0];
-    float imag0 = imagP1[0];
-
-    VectorMath::zvmul(realP1, imagP1, realP2, imagP2, realP1, imagP1, halfSize);
-
-    // Multiply the packed DC/nyquist component
-    realP1[0] = real0 * realP2[0];
-    imagP1[0] = imag0 * imagP2[0];
-}
-
 #if OS(WIN)
 // On Windows, the following pragmas are equivalent to compiling the code with /fp:fast. The
 // following code does not need precise FP semantics, and speed is critical here. See
 // crbug.com/316740 and crrev.com/116823002.
 #pragma float_control(except, off, push)
 #pragma float_control(precise, off, push)
 #pragma fp_contract(on)
 #pragma fenv_access(off)
 #endif
 
@@ skipping 72 matching lines @@
 
     RDFTContext* context = av_rdft_init(pow2size, (RDFTransformType)trans);
     return context;
 }
 
 } // namespace WebCore
 
 #endif // USE(WEBAUDIO_FFMPEG)
 
 #endif // ENABLE(WEB_AUDIO)