Resubmit of 149313003: Significantly cleans up the ImageWriter Operation class and subclasses.

chrome/browser/extensions/api/image_writer_private/image_writer_utils.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_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILS_H_
-#define CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILS_H_
-
-#include "base/files/file_path.h"
-#include "base/platform_file.h"
-
-namespace extensions {
-namespace image_writer_utils {
-
-// Utility class for writing data to a removable disk.
-class ImageWriter {
- public:
-  ImageWriter();
-  virtual ~ImageWriter();
-
-  // Note: If there is already a device open, it will be closed.
-  virtual bool Open(const base::FilePath& path);
-  virtual bool Close();
-
-  // Writes from data_block to the device, and returns the amount written or -1
-  // on error.
-  virtual int Write(const char* data_block, int data_size);
-
- private:
-   base::PlatformFile file_;
-   int writes_count_;
-};
-
-// Utility class for reading a large file, such as a Chrome OS image.
-class ImageReader {
- public:
-  ImageReader();
-  virtual ~ImageReader();
-
-  // Note: If there is already a file open, it will be closed.
-  virtual bool Open(const base::FilePath& path);
-  virtual bool Close();
-  // Read from the file into data_block.
-  virtual int Read(char* data_block, int data_size);
-  virtual int64 GetSize();
-
- private:
-  base::PlatformFile file_;
-};
-
-} // namespace image_writer_utils
-} // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_IMAGE_WRITER_PRIVATE_IMAGE_WRITER_UTILS_H_