Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/core/animation/LengthUnitsChecker.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 LengthUnitsChecker_h
 #define LengthUnitsChecker_h
 
 #include "core/animation/InterpolationType.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/resolver/StyleResolverState.h"
-#include "wtf/PtrUtil.h"
-#include <memory>
 
 namespace blink {
 
 class LengthUnitsChecker : public InterpolationType::ConversionChecker {
 public:
-    static std::unique_ptr<LengthUnitsChecker> maybeCreate(CSSLengthArray&& lengthArray, const StyleResolverState& state)
+    static PassOwnPtr<LengthUnitsChecker> maybeCreate(CSSLengthArray&& lengthArray, const StyleResolverState& state)
     {
         bool create = false;
         size_t lastIndex = 0;
         for (size_t i = 0; i < lengthArray.values.size(); i++) {
             if (i == CSSPrimitiveValue::UnitTypePercentage || !lengthArray.typeFlags.get(i))
                 continue;
             lengthArray.values[i] = lengthUnit(i, state.cssToLengthConversionData());
             create = true;
             lastIndex = i;
         }
         if (!create)
             return nullptr;
-        return wrapUnique(new LengthUnitsChecker(std::move(lengthArray), lastIndex));
+        return adoptPtr(new LengthUnitsChecker(std::move(lengthArray), lastIndex));
     }
 
     bool isValid(const InterpolationEnvironment& environment, const InterpolationValue& underlying) const final
     {
         for (size_t i = 0; i <= m_lastIndex; i++) {
             if (i == CSSPrimitiveValue::UnitTypePercentage || !m_lengthArray.typeFlags.get(i))
                 continue;
             if (m_lengthArray.values[i] != lengthUnit(i, environment.state().cssToLengthConversionData()))
                 return false;
         }
@@ skipping 11 matching lines @@
         , m_lastIndex(lastIndex)
     { }
 
     const CSSLengthArray m_lengthArray;
     const size_t m_lastIndex;
 };
 
 } // namespace blink
 
 #endif // LengthUnitsChecker_h