Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/style/DataPersistent.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 DataPersistent_h
 #define DataPersistent_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
-#include "wtf/PtrUtil.h"
-#include <memory>
+#include "wtf/OwnPtr.h"
 
 namespace blink {
 
 // DataPersistent<T> provides the copy-on-modify behavior of DataRef<>,
 // but for Persistent<> heap references.
 //
 // That is, the DataPersistent<T> copy assignment, |a = b;|, makes |a|
 // share a reference to the T object that |b| holds until |a| is mutated
 // and access() on it is called. Or, dually, if |b| is mutated after the
 // assignment that mutation isn't observable to |a| but will be performed
 // on a copy of the underlying T object.
 //
 // DataPersistent<T> does assume that no one keeps non-DataPersistent<> shared
 // references to the underlying T object that it manages, and is mutating the
 // object via those.
 template <typename T>
 class DataPersistent {
     USING_FAST_MALLOC(DataPersistent);
 public:
     DataPersistent()
         : m_ownCopy(false)
     {
     }
 
     DataPersistent(const DataPersistent& other)
         : m_ownCopy(false)
     {
         if (other.m_data)
-            m_data = wrapUnique(new Persistent<T>(other.m_data->get()));
+            m_data = adoptPtr(new Persistent<T>(other.m_data->get()));
 
         // Invalidated, subsequent mutations will happen on a new copy.
         //
         // (Clearing |m_ownCopy| will not be observable over T, hence
         // the const_cast<> is considered acceptable here.)
         const_cast<DataPersistent&>(other).m_ownCopy = false;
     }
 
     const T* get() const { return m_data ? m_data->get() : nullptr; }
 
     const T& operator*() const { return m_data ? *get() : nullptr; }
     const T* operator->() const { return get(); }
 
     T* access()
     {
         if (m_data && !m_ownCopy) {
             *m_data = (*m_data)->copy();
             m_ownCopy = true;
         }
         return m_data ? m_data->get() : nullptr;
     }
 
     void init()
     {
         ASSERT(!m_data);
-        m_data = wrapUnique(new Persistent<T>(T::create()));
+        m_data = adoptPtr(new Persistent<T>(T::create()));
         m_ownCopy = true;
     }
 
     bool operator==(const DataPersistent<T>& o) const
     {
         ASSERT(m_data);
         ASSERT(o.m_data);
         return m_data->get() == o.m_data->get() || *m_data->get() == *o.m_data->get();
     }
 
     bool operator!=(const DataPersistent<T>& o) const
     {
         ASSERT(m_data);
         ASSERT(o.m_data);
         return m_data->get() != o.m_data->get() && *m_data->get() != *o.m_data->get();
     }
 
     void operator=(std::nullptr_t) { m_data.clear(); }
 private:
     // Reduce size of DataPersistent<> by delaying creation of Persistent<>.
-    std::unique_ptr<Persistent<T>> m_data;
+    OwnPtr<Persistent<T>> m_data;
     unsigned m_ownCopy:1;
 };
 
 } // namespace blink
 
 #endif // DataPersistent_h