[fsp] Fix crash when reading files.

chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_READER_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_READER_H_
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 58 matching lines @@
                            base::File::Error result);
 
   // Called when fetching length of the file is completed with either a success
   // or an error.
   void OnGetMetadataForGetLengthReceived(
       const net::Int64CompletionCallback& callback,
       base::File::Error result,
       const base::File::Info& file_info);
 
   // Same as Read(), but called after initializing is completed.
-  void ReadAfterInitialized(net::IOBuffer* buffer,
+  void ReadAfterInitialized(scoped_refptr<net::IOBuffer> buffer,
                             int buffer_length,
                             const net::CompletionCallback& callback);
 
   // Same as GetLength(), but called after initializing is completed.
   void GetLengthAfterInitialized(const net::Int64CompletionCallback& callback);
 
   fileapi::FileSystemURL url_;
   int64 current_offset_;
   int64 current_length_;
   base::Time expected_modification_time_;
 
   // Set during initialization (in case of a success).
   base::WeakPtr<ProvidedFileSystemInterface> file_system_;
   base::FilePath file_path_;
   int file_handle_;
 
   base::WeakPtrFactory<FileStreamReader> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(FileStreamReader);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_FILE_STREAM_READER_H_