Downloads: replace BrowserThread::FILE with task scheduler.

content/browser/download/save_file.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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_SAVE_FILE_H_
 #define CONTENT_BROWSER_DOWNLOAD_SAVE_FILE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "content/browser/download/base_file.h"
 #include "content/browser/download/save_types.h"
 
 namespace content {
 // SaveFile ----------------------------------------------------------------
 
-// These objects live exclusively on the file thread and handle the writing
-// operations for one save item. These objects live only for the duration that
-// the saving job is 'in progress': once the saving job has been completed or
-// canceled, the SaveFile is destroyed. One SaveFile object represents one item
-// in a save session.
+// These objects live exclusively on the download task runner and handle the
+// writing operations for one save item. These objects live only for the
+// duration that  the saving job is 'in progress': once the saving job has been
+// completed or  canceled, the SaveFile is destroyed. One SaveFile object
+// represents one item in a save session.
 class SaveFile {
  public:
   explicit SaveFile(const SaveFileCreateInfo* info, bool calculate_hash);
   virtual ~SaveFile();
 
   // BaseFile delegated functions.
   DownloadInterruptReason Initialize();
   DownloadInterruptReason AppendDataToFile(const char* data, size_t data_len);
   DownloadInterruptReason Rename(const base::FilePath& full_path);
   void Detach();
@@ skipping 16 matching lines @@
  private:
   BaseFile file_;
   std::unique_ptr<const SaveFileCreateInfo> info_;
 
   DISALLOW_COPY_AND_ASSIGN(SaveFile);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_SAVE_FILE_H_