Change JSONReader::ReadToValue to return a scoped_ptr

base/json/json_reader.h

 // Copyright (c) 2012 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.
 //
 // A JSON parser.  Converts strings of JSON into a Value object (see
 // base/values.h).
 // http://www.ietf.org/rfc/rfc4627.txt?number=4627
 //
 // Known limitations/deviations from the RFC:
 // - Only knows how to parse ints within the range of a signed 32 bit int and
@@ skipping 97 matching lines @@
   static Value* ReadAndReturnError(const StringPiece& json,
                                    int options,  // JSONParserOptions
                                    int* error_code_out,
                                    std::string* error_msg_out);
 
   // Converts a JSON parse error code into a human readable message.
   // Returns an empty string if error_code is JSON_NO_ERROR.
   static std::string ErrorCodeToString(JsonParseError error_code);
 
   // Parses an input string into a Value that is owned by the caller.
-  Value* ReadToValue(const std::string& json);
+  scoped_ptr<Value> ReadToValue(const std::string& json);
 
   // Returns the error code if the last call to ReadToValue() failed.
   // Returns JSON_NO_ERROR otherwise.
   JsonParseError error_code() const;
 
   // Converts error_code_ to a human-readable string, including line and column
   // numbers if appropriate.
   std::string GetErrorMessage() const;
 
  private:
   scoped_ptr<internal::JSONParser> parser_;
 };
 
 }  // namespace base
 
 #endif  // BASE_JSON_JSON_READER_H_