Downloads: replace BrowserThread::FILE with task scheduler.

content/browser/download/download_file_impl.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_DOWNLOAD_FILE_IMPL_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_
 
 #include "content/browser/download/download_file.h"
 
 #include <stddef.h>
@@ skipping 20 matching lines @@
 
 namespace content {
 class ByteStreamReader;
 class DownloadDestinationObserver;
 
 class CONTENT_EXPORT DownloadFileImpl : public DownloadFile {
  public:
   // Takes ownership of the object pointed to by |request_handle|.
   // |net_log| will be used for logging the download file's events.
   // May be constructed on any thread.  All methods besides the constructor
-  // (including destruction) must occur on the FILE thread.
+  // (including destruction) must occur on the download task runner.
   //
   // Note that the DownloadFileImpl automatically reads from the passed in
   // stream, and sends updates and status of those reads to the
   // DownloadDestinationObserver.
-  DownloadFileImpl(
-      std::unique_ptr<DownloadSaveInfo> save_info,
-      const base::FilePath& default_downloads_directory,
-      std::unique_ptr<ByteStreamReader> stream_reader,
-      const net::NetLogWithSource& net_log,
-      base::WeakPtr<DownloadDestinationObserver> observer);
+  DownloadFileImpl(std::unique_ptr<DownloadSaveInfo> save_info,
+                   const base::FilePath& default_downloads_directory,
+                   std::unique_ptr<ByteStreamReader> stream_reader,
+                   const net::NetLogWithSource& net_log,
+                   base::WeakPtr<DownloadDestinationObserver> observer);
 
   ~DownloadFileImpl() override;
 
   // DownloadFile functions.
   void Initialize(const InitializeCallback& initialize_callback,
                   const CancelRequestCallback& cancel_request_callback,
                   const DownloadItem::ReceivedSlices& received_slices,
                   bool is_parallelizable) override;
 
   void AddByteStream(std::unique_ptr<ByteStreamReader> stream_reader,
@@ skipping 219 matching lines @@
 
   base::WeakPtr<DownloadDestinationObserver> observer_;
   base::WeakPtrFactory<DownloadFileImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadFileImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_FILE_IMPL_H_