JPEG decoding: replace ownership comments with std::unique_ptr.

ui/gfx/codec/jpeg_codec.h

 // Copyright (c) 2011 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 UI_GFX_CODEC_JPEG_CODEC_H_
 #define UI_GFX_CODEC_JPEG_CODEC_H_
 
 #include <stddef.h>
+
+#include <memory>
 #include <vector>
 
 #include "ui/gfx/gfx_export.h"
 
 class SkBitmap;
 
 namespace gfx {
 
 // Interface for encoding/decoding JPEG data. This is a wrapper around libjpeg,
 // which has an inconvenient interface for callers. This is only used for UI
@@ skipping 43 matching lines @@
 
   // Decodes the JPEG data contained in input of length input_size. The
   // decoded data will be placed in *output with the dimensions in *w and *h
   // on success (returns true). This data will be written in the'format'
   // format. On failure, the values of these output variables is undefined.
   static bool Decode(const unsigned char* input, size_t input_size,
                      ColorFormat format, std::vector<unsigned char>* output,
                      int* w, int* h);
 
   // Decodes the JPEG data contained in input of length input_size. If
-  // successful, a SkBitmap is created and returned. It is up to the caller
-  // to delete the returned bitmap.
-  static SkBitmap* Decode(const unsigned char* input, size_t input_size);
+  // successful, a SkBitmap is created and returned.
+  static std::unique_ptr<SkBitmap> Decode(const unsigned char* input,
+                                          size_t input_size);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CODEC_JPEG_CODEC_H_