Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/platform/image-encoders/PNGImageEncoder.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 18 matching lines @@
  */
 
 #ifndef PNGImageEncoder_h
 #define PNGImageEncoder_h
 
 #include "platform/geometry/IntSize.h"
 extern "C" {
 #include "png.h"
 }
 #include "wtf/Allocator.h"
+#include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
-#include <memory>
 
 namespace blink {
 
 struct ImageDataBuffer;
 
 class PLATFORM_EXPORT PNGImageEncoderState final {
     USING_FAST_MALLOC(PNGImageEncoderState);
     WTF_MAKE_NONCOPYABLE(PNGImageEncoderState);
 public:
-    static std::unique_ptr<PNGImageEncoderState> create(const IntSize& imageSize, Vector<unsigned char>* output);
+    static PassOwnPtr<PNGImageEncoderState> create(const IntSize& imageSize, Vector<unsigned char>* output);
     ~PNGImageEncoderState();
     png_struct* png() { ASSERT(m_png); return m_png; }
     png_info* info() { ASSERT(m_info); return m_info; }
 private:
     PNGImageEncoderState(png_struct* png, png_info* info) : m_png(png), m_info(info) { }
     png_struct* m_png;
     png_info* m_info;
 };
 
 class PLATFORM_EXPORT PNGImageEncoder {
     STATIC_ONLY(PNGImageEncoder);
 public:
     // Encode the input data with default compression quality. See also https://crbug.com/179289
     static bool encode(const ImageDataBuffer&, Vector<unsigned char>* output);
 
     // Functions for progressive image encoding
     static void writeOneRowToPng(unsigned char* pixels, PNGImageEncoderState*);
     static void finalizePng(PNGImageEncoderState*);
 };
 
 } // namespace blink
 
 #endif