DownloadManager intereface refactoring to allow cleaner DownloadItem unit tests.

chrome/browser/automation/testing_automation_provider.cc

 // Copyright (c) 2011 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 "chrome/browser/automation/testing_automation_provider.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 3141 matching lines @@
     return;
   }
 
   if (action == "open") {
     selected_item->AddObserver(
         new AutomationProviderDownloadUpdatedObserver(
             this, reply_message, true));
     selected_item->OpenDownload();
   } else if (action == "toggle_open_files_like_this") {
     DownloadPrefs* prefs =
-        DownloadPrefs::FromDownloadManager(selected_item->GetDownloadManager());
+        DownloadPrefs::FromBrowserContext(selected_item->BrowserContext());
     FilePath path = selected_item->GetUserVerifiedFilePath();
     if (!selected_item->ShouldOpenFileBasedOnExtension())
       prefs->EnableAutoOpenBasedOnExtension(path);
     else
       prefs->DisableAutoOpenBasedOnExtension(path);
     AutomationJSONReply(this, reply_message).SendSuccess(NULL);
   } else if (action == "remove") {
     download_manager->AddObserver(
         new AutomationProviderDownloadModelChangedObserver(
             this, reply_message, download_manager));
@@ skipping 3258 matching lines @@
 
   Send(reply_message_);
   redirect_query_ = 0;
   reply_message_ = NULL;
 }
 
 void TestingAutomationProvider::OnRemoveProvider() {
   if (g_browser_process)
     g_browser_process->GetAutomationProviderList()->RemoveProvider(this);
 }