Move utility functions for sample rate to AudioUtilities.

Source/platform/audio/HRTFPanner.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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 #ifndef HRTFPanner_h
 #define HRTFPanner_h
 
 #include "platform/audio/AudioDelayDSPKernel.h"
+#include "platform/audio/AudioUtilities.h"
 #include "platform/audio/FFTConvolver.h"
 #include "platform/audio/HRTFDatabaseLoader.h"
 #include "platform/audio/Panner.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT HRTFPanner FINAL : public Panner {
 public:
     HRTFPanner(float sampleRate, HRTFDatabaseLoader*);
     virtual ~HRTFPanner();
 
     // Panner
     virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) OVERRIDE;
     virtual void reset() OVERRIDE;
 
-    size_t fftSize() const { return fftSizeForSampleRate(m_sampleRate); }
-    static size_t fftSizeForSampleRate(float sampleRate);
+    size_t fftSize() const { return AudioUtilities::fftSizeForSampleRate(m_sampleRate); }
 
     float sampleRate() const { return m_sampleRate; }
 
     virtual double tailTime() const OVERRIDE;
     virtual double latencyTime() const OVERRIDE;
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     // Given an azimuth angle in the range -180 -> +180, returns the corresponding azimuth index for the database,
@@ skipping 46 matching lines @@
 
     AudioFloatArray m_tempL1;
     AudioFloatArray m_tempR1;
     AudioFloatArray m_tempL2;
     AudioFloatArray m_tempR2;
 };
 
 } // namespace blink
 
 #endif // HRTFPanner_h