Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/layout/LayoutGeometryMapStep.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 12 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef LayoutGeometryMapStep_h
 #define LayoutGeometryMapStep_h
 
 #include "platform/geometry/LayoutSize.h"
 #include "platform/transforms/TransformationMatrix.h"
 #include "wtf/Allocator.h"
-#include <memory>
+#include "wtf/OwnPtr.h"
 
 namespace blink {
 
 class LayoutObject;
 
 enum GeometryInfoFlag {
     AccumulatingTransform = 1 << 0,
     IsNonUniform = 1 << 1, // Mapping depends on the input point, e.g. because of CSS columns.
     IsFixedPosition = 1 << 2,
     HasTransform = 1 << 3,
@@ skipping 12 matching lines @@
     {
         ASSERT(!o.m_transform);
     }
     LayoutGeometryMapStep(const LayoutObject* layoutObject, GeometryInfoFlags flags)
         : m_layoutObject(layoutObject)
         , m_flags(flags)
     {
     }
     const LayoutObject* m_layoutObject;
     LayoutSize m_offset;
-    std::unique_ptr<TransformationMatrix> m_transform; // Includes offset if non-null.
+    OwnPtr<TransformationMatrix> m_transform; // Includes offset if non-null.
     // If m_offsetForFixedPosition could only apply to the fixed position steps, we may be able to merge
     // with m_offsetForStickyPosition and simplify mapping.
     LayoutSize m_offsetForFixedPosition;
     LayoutSize m_offsetForStickyPosition;
     GeometryInfoFlags m_flags;
 };
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::LayoutGeometryMapStep);
 
 #endif // LayoutGeometryMapStep_h