MTP Streaming: Optimize block reading

chrome/browser/media_galleries/fileapi/mtp_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_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_
 
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/memory/ref_counted.h"
@@ skipping 20 matching lines @@
 
   virtual ~MTPFileStreamReader();
 
   // FileStreamReader overrides.
   virtual int Read(net::IOBuffer* buf, int buf_len,
                    const net::CompletionCallback& callback) OVERRIDE;
   virtual int64 GetLength(
       const net::Int64CompletionCallback& callback) OVERRIDE;
 
  private:
-  void OnFileInfoForRead(net::IOBuffer* buf, int buf_len,
-                         const net::CompletionCallback& callback,
-                         const base::File::Info& file_info);
-
   void FinishValidateMediaHeader(
       net::IOBuffer* header_buf,
-      const base::File::Info& file_info,
       net::IOBuffer* buf, int buf_len,
       const net::CompletionCallback& callback,
+      const base::File::Info& file_info,
       int header_bytes_read);
 
   void FinishRead(const net::CompletionCallback& callback,
-                  int bytes_read);
+                  const base::File::Info& file_info, int bytes_read);
 
   void FinishGetLength(const net::Int64CompletionCallback& callback,
                        const base::File::Info& file_info);
 
   scoped_refptr<fileapi::FileSystemContext> file_system_context_;
   fileapi::FileSystemURL url_;
   int64 current_offset_;
   const base::Time expected_modification_time_;
 
   bool media_header_validated_;
 
   base::WeakPtrFactory<MTPFileStreamReader> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MTPFileStreamReader);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MTP_FILE_STREAM_READER_H_