Show or open downloaded items on the UI thread for Mac

chrome/browser/download/save_file_manager.h

 // Copyright (c) 2006-2008 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.
 //
 // Objects that handle file operations for saving files, on the file thread.
 //
 // The SaveFileManager owns a set of SaveFile objects, each of which connects
 // with a SaveItem object which belongs to one SavePackage and runs on the file
 // thread for saving data in order to avoid disk activity on either network IO
 // thread or the UI thread. It coordinates the notifications from the network
@@ skipping 97 matching lines @@
 
   // Notifications sent from the UI thread and run on the file thread.
   // Cancel a SaveFile instance which has specified save id.
   void CancelSave(int save_id);
 
   // Called on the UI thread to remove a save package from SaveFileManager's
   // tracking map.
   void RemoveSaveFile(int save_id, const GURL& save_url,
                       SavePackage* package);
 
-  // Handler for shell operations sent from the UI to the file thread.
+#if !defined(OS_MACOSX)
+  // Handler for shell operations sent from the UI to the file thread. Mac OS X
+  // requires opening downloads on the UI thread, so it does not use this
+  // method.
   void OnShowSavedFileInShell(const FilePath full_path);
+#endif
 
   // Helper function for deleting specified file.
   void DeleteDirectoryOrFile(const FilePath& full_path, bool is_dir);
 
-  // For posting notifications from the UI and IO threads.
-  MessageLoop* GetSaveLoop() const { return file_loop_; }
+  // For posting notifications from the UI and file threads.
+  MessageLoop* ui_loop() const { return ui_loop_; }
+  MessageLoop* file_loop() const { return file_loop_; }
 
   // Runs on file thread to save a file by copying from file system when
   // original url is using file scheme.
   void SaveLocalFile(const GURL& original_file_url,
                      int save_id,
                      int render_process_id);
 
   // Renames all the successfully saved files.
   // |final_names| points to a vector which contains pairs of save ids and
   // final names of successfully saved files.
@@ skipping 118 matching lines @@
   // hashmap since it is possible to save same URL in different tab at
   // same time.
   typedef base::hash_map<std::string, SavePackage*> StartingRequestsMap;
   typedef base::hash_map<int, StartingRequestsMap> TabToStartingRequestsMap;
   TabToStartingRequestsMap tab_starting_requests_;
 
   DISALLOW_EVIL_CONSTRUCTORS(SaveFileManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_SAVE_FILE_MANAGER_H__