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 50ce699b4071e4071084393e21afc5b6564bac48..d56b74649823fddb96181c3a126baec4f2db801c 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"
@@ -553,10 +552,8 @@ 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_;