Create the download folder if it doesn't exist. That is, the actual download ...

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 40 matching lines @@
 //
 // The SaveFileManager tracks saving requests, mapping from a save ID
 // (unique integer created in the IO thread) to the SavePackage for the
 // tab where the saving job was initiated. In the event of a tab closure
 // during saving, the SavePackage will notice the SaveFileManage to
 // cancel all SaveFile job.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_SAVE_FILE_MANAGER_H__
 #define CHROME_BROWSER_DOWNLOAD_SAVE_FILE_MANAGER_H__
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/hash_tables.h"
 #include "base/ref_counted.h"
 #include "chrome/browser/download/save_types.h"
 
 namespace net {
 class IOBuffer;
 }
 class GURL;
@@ skipping 44 matching lines @@
   void RemoveSaveFile(int save_id, const GURL& save_url,
                       SavePackage* package);
 
 #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 to create the download directory.
+  void CreateDownloadDirectory(FilePath save_dir,
+                               SavePackage* save_package);
   // Helper function for deleting specified file.
   void DeleteDirectoryOrFile(const FilePath& full_path, bool is_dir);
 
   // 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,
@@ skipping 120 matching lines @@
   // as starting requests. For tracking those starting requests, we need to
   // have some data structure.
   // First we use a hashmap to map the request URL to SavePackage, then we
   // use a hashmap to map the tab id (we actually use render_process_id) to the
   // 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);
+  DISALLOW_COPY_AND_ASSIGN(SaveFileManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_SAVE_FILE_MANAGER_H__