Return unique_ptr<>s from fxcodec/

core/fxcodec/codec/ccodec_flatemodule.h

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef CORE_FXCODEC_CODEC_CCODEC_FLATEMODULE_H_
 #define CORE_FXCODEC_CODEC_CCODEC_FLATEMODULE_H_
 
+#include <memory>
+
 #include "core/fxcrt/fx_system.h"
 
 class CCodec_ScanlineDecoder;
 
 class CCodec_FlateModule {
  public:
-  CCodec_ScanlineDecoder* CreateDecoder(const uint8_t* src_buf,
-                                        uint32_t src_size,
-                                        int width,
-                                        int height,
-                                        int nComps,
-                                        int bpc,
-                                        int predictor,
-                                        int Colors,
-                                        int BitsPerComponent,
-                                        int Columns);
+  std::unique_ptr<CCodec_ScanlineDecoder> CreateDecoder(const uint8_t* src_buf,
+                                                        uint32_t src_size,
+                                                        int width,
+                                                        int height,
+                                                        int nComps,
+                                                        int bpc,
+                                                        int predictor,
+                                                        int Colors,
+                                                        int BitsPerComponent,
+                                                        int Columns);
   uint32_t FlateOrLZWDecode(bool bLZW,
                             const uint8_t* src_buf,
                             uint32_t src_size,
                             bool bEarlyChange,
                             int predictor,
                             int Colors,
                             int BitsPerComponent,
                             int Columns,
                             uint32_t estimated_size,
                             uint8_t*& dest_buf,
                             uint32_t& dest_size);
   bool Encode(const uint8_t* src_buf,
               uint32_t src_size,
               uint8_t** dest_buf,
               uint32_t* dest_size);
   bool PngEncode(const uint8_t* src_buf,
                  uint32_t src_size,
                  uint8_t** dest_buf,
                  uint32_t* dest_size);
 };
 
 #endif  // CORE_FXCODEC_CODEC_CCODEC_FLATEMODULE_H_