remove WTF::Complex

Source/platform/audio/Biquad.cpp

Index: Source/platform/audio/Biquad.cpp
diff --git a/Source/platform/audio/Biquad.cpp b/Source/platform/audio/Biquad.cpp
index 21df7745a9eb198b30491638b5b968fa59a220fb..e614c7c1b62b604727e02254a9f2105b8ef4f914 100644
--- a/Source/platform/audio/Biquad.cpp
+++ b/Source/platform/audio/Biquad.cpp
@@ -524,7 +524,7 @@ void Biquad::setBandpassParams(double frequency, double Q)
     }
 }
 
-void Biquad::setZeroPolePairs(const Complex &zero, const Complex &pole)
+void Biquad::setZeroPolePairs(const std::complex<double>&zero, const std::complex<double>&pole)
 {
     double b0 = 1;
     double b1 = -2 * zero.real();
@@ -539,9 +539,9 @@ void Biquad::setZeroPolePairs(const Complex &zero, const Complex &pole)
     setNormalizedCoefficients(b0, b1, b2, 1, a1, a2);
 }
 
-void Biquad::setAllpassPole(const Complex &pole)
+void Biquad::setAllpassPole(const std::complex<double>&pole)
 {
-    Complex zero = Complex(1, 0) / pole;
+    std::complex<double> zero = std::complex<double>(1, 0) / pole;
     setZeroPolePairs(zero, pole);
 }
 
@@ -575,10 +575,11 @@ void Biquad::getFrequencyResponse(int nFrequencies,
 
     for (int k = 0; k < nFrequencies; ++k) {
         double omega = -piDouble * frequency[k];
-        Complex z = Complex(cos(omega), sin(omega));
-        Complex numerator = b0 + (b1 + b2 * z) * z;
-        Complex denominator = Complex(1, 0) + (a1 + a2 * z) * z;
-        Complex response = numerator / denominator;
+        std::complex<double> z = std::complex<double> (cos(omega), sin(omega));
+        std::complex<double> numerator = b0 + (b1 + b2 * z) * z;
+        std::complex<double> denominator =
+            std::complex<double>(1, 0) + (a1 + a2 * z) * z;
+        std::complex<double> response = numerator / denominator;
         magResponse[k] = static_cast<float>(abs(response));
         phaseResponse[k] = static_cast<float>(atan2(imag(response), real(response)));
     }