Replace the DownloadFileManager with direct ownership

content/browser/download/download_item_impl_delegate.cc

Index: content/browser/download/download_item_impl_delegate.cc
diff --git a/content/browser/download/download_item_impl_delegate.cc b/content/browser/download/download_item_impl_delegate.cc
index 4a889f77d24e5dc68b198fa70e16b162aeb9bd38..0b9ea109646d1af45af34eaf04b90fec4742d3dd 100644
--- a/content/browser/download/download_item_impl_delegate.cc
+++ b/content/browser/download/download_item_impl_delegate.cc
@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/logging.h"
 #include "content/browser/download/download_item_impl_delegate.h"
 
+#include "base/logging.h"
+#include "content/browser/download/download_file_factory.h"
+
 class DownloadItemImpl;
 
 // Infrastructure in DownloadItemImplDelegate to assert invariant that
@@ -25,12 +27,15 @@ void DownloadItemImplDelegate::Detach() {
   --count_;
 }
 
-bool DownloadItemImplDelegate::ShouldOpenFileBasedOnExtension(
-    const FilePath& path) {
+void DownloadItemImplDelegate::DelegateStart(
+    DownloadItemImpl* download_item) {}
+
+bool DownloadItemImplDelegate::ShouldOpenDownload(DownloadItemImpl* download) {
   return false;
 }
 
-bool DownloadItemImplDelegate::ShouldOpenDownload(DownloadItemImpl* download) {
+bool DownloadItemImplDelegate::ShouldOpenFileBasedOnExtension(
+    const FilePath& path) {
   return false;
 }