Replace the DownloadFileManager with direct ownership

chrome/browser/download/download_browsertest.cc

Index: chrome/browser/download/download_browsertest.cc
diff --git a/chrome/browser/download/download_browsertest.cc b/chrome/browser/download/download_browsertest.cc
index c6ae215c872efe0d82d5e9fb432c342d0822a08f..d4934af1175b003ce078b6106e3de287ed74bc5f 100644
--- a/chrome/browser/download/download_browsertest.cc
+++ b/chrome/browser/download/download_browsertest.cc
@@ -773,7 +773,8 @@ class DownloadTest : public InProcessBrowserTest {
 
     // Set up file failures.
     scoped_refptr<content::TestFileErrorInjector> injector(
-        content::TestFileErrorInjector::Create());
+        content::TestFileErrorInjector::Create(
+            DownloadManagerForBrowser(browser())));
 
     for (size_t i = 0; i < count; ++i) {
       // Set up the full URL, for download file tracking.