Move utility functions for sample rate to AudioUtilities.

Source/platform/audio/HRTFElevation.cpp

Index: Source/platform/audio/HRTFElevation.cpp
diff --git a/Source/platform/audio/HRTFElevation.cpp b/Source/platform/audio/HRTFElevation.cpp
index a7a4aac6c2a2da71ba9e209867a2d1e86b239aa7..867ebb39b9b5b1ac372eaba35a73278b8c3c050c 100644
--- a/Source/platform/audio/HRTFElevation.cpp
+++ b/Source/platform/audio/HRTFElevation.cpp
@@ -32,13 +32,15 @@
 
 #include "platform/audio/HRTFElevation.h"
 
-#include <math.h>
-#include <algorithm>
 #include "platform/audio/AudioBus.h"
-#include "platform/audio/HRTFPanner.h"
+#include "platform/audio/AudioUtilities.h"
+#include "platform/audio/HRTFDatabase.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/text/StringHash.h"
 
+#include <algorithm>
+#include <math.h>
+
 namespace blink {
 
 const unsigned HRTFElevation::AzimuthSpacing = 15;
@@ -166,7 +168,7 @@ bool HRTFElevation::calculateKernelsForAzimuthElevation(int azimuth, int elevati
 #endif
 
     // Note that depending on the fftSize returned by the panner, we may be truncating the impulse response we just loaded in.
-    const size_t fftSize = HRTFPanner::fftSizeForSampleRate(sampleRate);
+    const size_t fftSize = AudioUtilities::fftSizeForSampleRate(sampleRate);
     kernelL = HRTFKernel::create(leftEarImpulseResponse, fftSize, sampleRate);
     kernelR = HRTFKernel::create(rightEarImpulseResponse, fftSize, sampleRate);