Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/animation/UnderlyingValueOwner.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 UnderlyingValueOwner_h
 #define UnderlyingValueOwner_h
 
 #include "core/animation/TypedInterpolationValue.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
-#include <memory>
 
 namespace blink {
 
 // Handles memory management of underlying InterpolationValues in applyStack()
 // Ensures we perform copy on write if we are not the owner of an underlying InterpolationValue.
-// This functions similar to a DataRef except on std::unique_ptr'd objects.
+// This functions similar to a DataRef except on OwnPtr'd objects.
 class UnderlyingValueOwner {
     WTF_MAKE_NONCOPYABLE(UnderlyingValueOwner);
     STACK_ALLOCATED();
 
 public:
     UnderlyingValueOwner()
         : m_type(nullptr)
         , m_valueOwner(nullptr)
         , m_value(nullptr)
     { }
 
     operator bool() const
     {
         ASSERT(static_cast<bool>(m_type) == static_cast<bool>(m_value));
         return m_type;
     }
 
     const InterpolationType& type() const
     {
         ASSERT(m_type);
         return *m_type;
     }
 
     const InterpolationValue& value() const;
 
     void set(std::nullptr_t);
     void set(const InterpolationType&, const InterpolationValue&);
     void set(const InterpolationType&, InterpolationValue&&);
-    void set(std::unique_ptr<TypedInterpolationValue>);
+    void set(PassOwnPtr<TypedInterpolationValue>);
     void set(const TypedInterpolationValue*);
 
     InterpolationValue& mutableValue();
 
 private:
     const InterpolationType* m_type;
     InterpolationValue m_valueOwner;
     const InterpolationValue* m_value;
 };
 
 } // namespace blink
 
 #endif // UnderlyingValueOwner_h