Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/webaudio/IIRProcessor.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IIRProcessor_h
 #define IIRProcessor_h
 
 #include "modules/webaudio/AudioNode.h"
 #include "platform/audio/AudioDSPKernel.h"
 #include "platform/audio/AudioDSPKernelProcessor.h"
 #include "platform/audio/IIRFilter.h"
-#include <memory>
 
 namespace blink {
 
 class IIRDSPKernel;
 
 class IIRProcessor final : public AudioDSPKernelProcessor {
 public:
     IIRProcessor(float sampleRate, size_t numberOfChannels,
         const Vector<double>& feedforwardCoef, const Vector<double>& feedbackCoef);
     ~IIRProcessor() override;
 
-    std::unique_ptr<AudioDSPKernel> createKernel() override;
+    PassOwnPtr<AudioDSPKernel> createKernel() override;
 
     void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) override;
 
     // Get the magnitude and phase response of the filter at the given
     // set of frequencies (in Hz). The phase response is in radians.
     void getFrequencyResponse(int nFrequencies, const float* frequencyHz, float* magResponse, float* phaseResponse);
 
     AudioDoubleArray* feedback() { return &m_feedback; }
     AudioDoubleArray* feedforward() { return &m_feedforward; }
 
 private:
     // The feedback and feedforward filter coefficients for the IIR filter.
     AudioDoubleArray m_feedback;
     AudioDoubleArray m_feedforward;
     // This holds the IIR kernel for computing the frequency response.
-    std::unique_ptr<IIRDSPKernel> m_responseKernel;
+    OwnPtr<IIRDSPKernel> m_responseKernel;
 };
 
 } // namespace blink
 
 #endif // IIRProcessor_h