Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/audio/Spatializer.h

 // Copyright 2014 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 Spatializer_h
 #define Spatializer_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
-#include <memory>
+#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class AudioBus;
 
 // Abstract base class for spatializing a mono or stereo source.
 class PLATFORM_EXPORT Spatializer {
     USING_FAST_MALLOC(Spatializer);
     WTF_MAKE_NONCOPYABLE(Spatializer);
 public:
     enum {
         PanningModelEqualPower = 0
 
         // We have a plan to add more panning models other than equal-power.
         // (such as binaural-HRTF or N-channel surround panning)
     };
 
     typedef unsigned PanningModel;
 
-    static std::unique_ptr<Spatializer> create(PanningModel, float sampleRate);
+    static PassOwnPtr<Spatializer> create(PanningModel, float sampleRate);
     virtual ~Spatializer();
 
     // Handle sample-accurate panning by AudioParam automation.
     virtual void panWithSampleAccurateValues(const AudioBus* inputBus, AudioBus* outputBuf, const float* panValues, size_t framesToProcess) = 0;
 
     // Handle de-zippered panning to a target value.
     virtual void panToTargetValue(const AudioBus* inputBus, AudioBus* outputBuf, float panValue, size_t framesToProcess) = 0;
 
     virtual void reset() = 0;
     virtual double tailTime() const = 0;
     virtual double latencyTime() const = 0;
 
 protected:
     explicit Spatializer(PanningModel model) { }
 };
 
 } // namespace blink
 
 #endif // Spatializer_h