remove WTF::Complex

Source/platform/audio/FFTFrame.cpp

Index: Source/platform/audio/FFTFrame.cpp
diff --git a/Source/platform/audio/FFTFrame.cpp b/Source/platform/audio/FFTFrame.cpp
index f6de464d4bd85beb6b6d2570a308f38f91165547..e3890aa88250470945afe01e7e79490e62feaefa 100644
--- a/Source/platform/audio/FFTFrame.cpp
+++ b/Source/platform/audio/FFTFrame.cpp
@@ -34,10 +34,11 @@
 
 #include "platform/audio/VectorMath.h"
 #include "platform/Logging.h"
-#include "wtf/Complex.h"
 #include "wtf/MathExtras.h"
 #include "wtf/OwnPtr.h"
 
+#include <complex>
+
 #ifndef NDEBUG
 #include <stdio.h>
 #endif
@@ -100,8 +101,8 @@ void FFTFrame::interpolateFrequencyComponents(const FFTFrame& frame1, const FFTF
     int n = m_FFTSize / 2;
 
     for (int i = 1; i < n; ++i) {
-        Complex c1(realP1[i], imagP1[i]);
-        Complex c2(realP2[i], imagP2[i]);
+        std::complex<double> c1(realP1[i], imagP1[i]);
+        std::complex<double> c2(realP2[i], imagP2[i]);
 
         double mag1 = abs(c1);
         double mag2 = abs(c2);
@@ -167,7 +168,7 @@ void FFTFrame::interpolateFrequencyComponents(const FFTFrame& frame1, const FFTF
         if (phaseAccum < -piDouble)
             phaseAccum += twoPiDouble;
 
-        Complex c = complexFromMagnitudePhase(mag, phaseAccum);
+        std::complex<double> c = std::polar(mag, phaseAccum);
 
         realP[i] = static_cast<float>(c.real());
         imagP[i] = static_cast<float>(c.imag());
@@ -189,7 +190,7 @@ double FFTFrame::extractAverageGroupDelay()
 
     // Calculate weighted average group delay
     for (int i = 0; i < halfSize; i++) {
-        Complex c(realP[i], imagP[i]);
+        std::complex<double> c(realP[i], imagP[i]);
         double mag = abs(c);
         double phase = arg(c);
 
@@ -236,13 +237,13 @@ void FFTFrame::addConstantGroupDelay(double sampleFrameDelay)
 
     // Add constant group delay
     for (int i = 1; i < halfSize; i++) {
-        Complex c(realP[i], imagP[i]);
+        std::complex<double> c(realP[i], imagP[i]);
         double mag = abs(c);
         double phase = arg(c);
 
         phase += i * phaseAdj;
 
-        Complex c2 = complexFromMagnitudePhase(mag, phase);
+        std::complex<double> c2 = std::polar(mag, phase);
 
         realP[i] = static_cast<float>(c2.real());
         imagP[i] = static_cast<float>(c2.imag());