Parameterize the PrefService that AutofillDownloadManager uses.

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index 4c76295dfdeae63d9fe86cda5bf10f1e60775339..5e8539f393253226111be0ce4b20d6a9369352ef 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -202,7 +202,9 @@ AutofillManager::AutofillManager(
   if (enable_download_manager == ENABLE_AUTOFILL_DOWNLOAD_MANAGER) {
     download_manager_.reset(
         new AutofillDownloadManager(
-            driver->GetWebContents()->GetBrowserContext(), this));
+            driver->GetWebContents()->GetBrowserContext(),
+            manager_delegate_->GetPrefs(),
+            this));
   }
 }