Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/heap/PersistentNode.h

 // Copyright 2015 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 PersistentNode_h
 #define PersistentNode_h
 
 #include "platform/PlatformExport.h"
 #include "platform/heap/ThreadState.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
-#include "wtf/PtrUtil.h"
 #include "wtf/ThreadingPrimitives.h"
-#include <memory>
 
 namespace blink {
 
 class CrossThreadPersistentRegion;
 
 class PersistentNode final {
     DISALLOW_NEW();
 public:
     PersistentNode()
         : m_self(nullptr)
@@ skipping 142 matching lines @@
     PersistentNode* m_freeListHead;
     PersistentNodeSlots* m_slots;
 #if ENABLE(ASSERT)
     int m_persistentCount;
 #endif
 };
 
 class CrossThreadPersistentRegion final {
     USING_FAST_MALLOC(CrossThreadPersistentRegion);
 public:
-    CrossThreadPersistentRegion() : m_persistentRegion(wrapUnique(new PersistentRegion)) { }
+    CrossThreadPersistentRegion() : m_persistentRegion(adoptPtr(new PersistentRegion)) { }
 
     void allocatePersistentNode(PersistentNode*& persistentNode, void* self, TraceCallback trace)
     {
         MutexLocker lock(m_mutex);
         PersistentNode* node = m_persistentRegion->allocatePersistentNode(self, trace);
         releaseStore(reinterpret_cast<void* volatile*>(&persistentNode), node);
     }
 
     void freePersistentNode(PersistentNode*& persistentNode)
     {
@@ skipping 49 matching lines @@
     }
 
     void unlock()
     {
         m_mutex.unlock();
     }
 
     // We don't make CrossThreadPersistentRegion inherit from PersistentRegion
     // because we don't want to virtualize performance-sensitive methods
     // such as PersistentRegion::allocate/freePersistentNode.
-    std::unique_ptr<PersistentRegion> m_persistentRegion;
+    OwnPtr<PersistentRegion> m_persistentRegion;
 
     // Recursive as prepareForThreadStateTermination() clears a PersistentNode's
     // associated Persistent<> -- it in turn freeing the PersistentNode. And both
     // CrossThreadPersistentRegion operations need a lock on the region before
     // mutating.
     RecursiveMutex m_mutex;
 };
 
 } // namespace blink
 
 #endif