Revert 154294 - Remove DownloadFileManager in favor of direct ownership of DownloadFiles.

content/browser/download/download_file_factory.cc

-// 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.
-
-#include "content/browser/download/download_file_factory.h"
-
-#include "content/browser/download/download_file_impl.h"
-#include "content/browser/power_save_blocker.h"
-
-namespace content {
-
-DownloadFileFactory::~DownloadFileFactory() {}
-
-content::DownloadFile* DownloadFileFactory::CreateFile(
-    const content::DownloadSaveInfo& save_info,
-    GURL url,
-    GURL referrer_url,
-    int64 received_bytes,
-    bool calculate_hash,
-    scoped_ptr<content::ByteStreamReader> stream,
-    const net::BoundNetLog& bound_net_log,
-    base::WeakPtr<content::DownloadDestinationObserver> observer) {
-  scoped_ptr<content::PowerSaveBlocker> psb(
-      new content::PowerSaveBlocker(
-          content::PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
-          "Download in progress"));
-  return new DownloadFileImpl(
-      save_info, url, referrer_url, received_bytes, calculate_hash,
-      stream.Pass(), bound_net_log, psb.Pass(), observer);
-}
-
-}  // namespace content