Replace the DownloadFileManager with direct ownership

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 56c29983eada4cc057cac4285b906fbb00fefe7a..c83128f739e01f4ab16ec91b645dad673cb23104 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -16,7 +16,6 @@
 #include "base/string_number_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "content/browser/browser_thread_impl.h"
-#include "content/browser/download/download_file_manager.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/gamepad/gamepad_service.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
@@ -535,10 +534,8 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
 
         // Clean up state that lives on or uses the file_thread_ before
         // it goes away.
-        if (resource_dispatcher_host_.get()) {
-          resource_dispatcher_host_.get()->download_file_manager()->Shutdown();
+        if (resource_dispatcher_host_.get())
           resource_dispatcher_host_.get()->save_file_manager()->Shutdown();
-        }
         break;
       case BrowserThread::PROCESS_LAUNCHER:
         thread_to_stop = &process_launcher_thread_;