Replace the DownloadFileManager with direct ownership

chrome/browser/download/download_browsertest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 755 matching lines @@
     if (info.download_info.show_download_item)
       EXPECT_TRUE(injector->HadFile(GURL(info.error_info.url))) << s.str();
   }
 
   void DownloadInsertFilesErrorCheckErrors(size_t count,
                                            FileErrorInjectInfo* info) {
     DownloadFilesCheckErrorsSetup();
 
     // 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.
       std::string server_path = "files/downloads/";
       server_path += info[i].download_info.url_name;
       GURL url = test_server()->GetURL(server_path);
       info[i].error_info.url = url.spec();
 
       DownloadInsertFilesErrorCheckErrorsLoopBody(injector, info[i], i);
     }
@@ skipping 1674 matching lines @@
   GetDownloads(browser(), &download_items);
   ASSERT_EQ(1u, download_items.size());
   ASSERT_EQ(test_server()->GetURL("echoheader?Referer"),
             download_items[0]->GetOriginalUrl());
 
   // Check that the file contains the expected referrer.
   FilePath file(download_items[0]->GetFullPath());
   std::string expected_contents = test_server()->GetURL("").spec();
   ASSERT_TRUE(VerifyFile(file, expected_contents, expected_contents.length()));
 }