Remove redundancies of multiply() in FFTFrame.

Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp

Index: Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
diff --git a/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp b/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
index e97298b3f738b40e4ee8ce5847059756df9ffd24..faadfdda6fc89289e5454771d27bfaf6f18a0074 100644
--- a/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
+++ b/Source/platform/audio/ffmpeg/FFTFrameFFMPEG.cpp
@@ -107,27 +107,6 @@ FFTFrame::~FFTFrame()
     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