Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/dom/CompositorProxiedPropertySet.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 CompositorProxiedPropertySet_h
 #define CompositorProxiedPropertySet_h
 
 #include "platform/graphics/CompositorMutableProperties.h"
 #include "wtf/Allocator.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
-#include <memory>
 
 namespace blink {
 
 // Keeps track of the number of proxies bound to each property.
 class CompositorProxiedPropertySet final {
     WTF_MAKE_NONCOPYABLE(CompositorProxiedPropertySet);
     USING_FAST_MALLOC(CompositorProxiedPropertySet);
 public:
-    static std::unique_ptr<CompositorProxiedPropertySet> create();
+    static PassOwnPtr<CompositorProxiedPropertySet> create();
     virtual ~CompositorProxiedPropertySet();
 
     bool isEmpty() const;
     void increment(uint32_t mutableProperties);
     void decrement(uint32_t mutableProperties);
     uint32_t proxiedProperties() const;
 
 private:
     CompositorProxiedPropertySet();
 
     unsigned short m_counts[CompositorMutableProperty::kNumProperties];
 };
 
 } // namespace blink
 
 #endif // CompositorProxiedPropertySet_h