Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/filesystem/FileWriterBase.h

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (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 FileWriterBase_h
 #define FileWriterBase_h
 
 #include "platform/heap/Handle.h"
-#include <memory>
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class WebFileWriter;
 
 class FileWriterBase : public GarbageCollectedMixin {
 public:
     virtual ~FileWriterBase();
-    void initialize(std::unique_ptr<WebFileWriter>, long long length);
+    void initialize(PassOwnPtr<WebFileWriter>, long long length);
 
     long long position() const
     {
         return m_position;
     }
     long long length() const
     {
         return m_length;
     }
 
@@ skipping 13 matching lines @@
     }
 
     void setLength(long long length)
     {
         m_length = length;
     }
 
     void seekInternal(long long position);
 
 private:
-    std::unique_ptr<WebFileWriter> m_writer;
+    OwnPtr<WebFileWriter> m_writer;
     long long m_position;
     long long m_length;
 };
 
 } // namespace blink
 
 #endif // FileWriterBase_h