[Blob] Fix for resetting reader.

storage/browser/blob/blob_reader.h

 // Copyright 2015 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 STORAGE_BROWSER_BLOB_BLOB_READER_H_
 #define STORAGE_BROWSER_BLOB_BLOB_READER_H_
 
 #include <stdint.h>
 #include <map>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "net/base/completion_callback.h"
+#include "net/base/net_errors.h"
 #include "storage/browser/storage_browser_export.h"
 
 class GURL;
 
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 class TaskRunner;
 class Time;
 }
@@ skipping 130 matching lines @@
   void SetFileReaderAtIndex(size_t index, scoped_ptr<FileStreamReader> reader);
   // Creates a FileStreamReader for the item with additional_offset.
   scoped_ptr<FileStreamReader> CreateFileStreamReader(
       const BlobDataItem& item,
       uint64_t additional_offset);
 
   scoped_ptr<BlobDataSnapshot> blob_data_;
   scoped_ptr<FileStreamReaderProvider> file_stream_provider_;
   scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
 
-  int net_error_;
-  bool item_list_populated_ = false;
+  int net_error_ = net::OK;
   std::vector<uint64_t> item_length_list_;
 
   scoped_refptr<net::DrainableIOBuffer> read_buf_;
 
   bool total_size_calculated_ = false;
   uint64_t total_size_ = 0;
   uint64_t remaining_bytes_ = 0;
   size_t pending_get_file_info_count_ = 0;
-  std::map<size_t, FileStreamReader*> index_to_reader_;
+  std::map<size_t, scoped_ptr<FileStreamReader>> index_to_reader_;
   size_t current_item_index_ = 0;
   uint64_t current_item_offset_ = 0;
 
   bool io_pending_ = false;
 
   net::CompletionCallback size_callback_;
   net::CompletionCallback read_callback_;
 
   base::WeakPtrFactory<BlobReader> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(BlobReader);
 };
 
 }  // namespace storage
 #endif  // STORAGE_BROWSER_BLOB_BLOB_READER_H_