When the download folder does not exist, change the download folder to a user's "Downloads"

chrome/browser/renderer_host/save_file_resource_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_SAVE_FILE_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_SAVE_FILE_RESOURCE_HANDLER_H_
 #pragma once
 
 #include <string>
 
+#include "base/file_path.h"
 #include "content/browser/renderer_host/resource_handler.h"
 #include "googleurl/src/gurl.h"
 
 class SaveFileManager;
 
 // Forwards data to the save thread.
 class SaveFileResourceHandler : public ResourceHandler {
  public:
   SaveFileResourceHandler(int render_process_host_id,
                           int render_view_id,
                           const GURL& url,
+                          const FilePath& default_download_dir,
                           SaveFileManager* manager);
 
   // ResourceHandler Implementation:
   virtual bool OnUploadProgress(int request_id, uint64 position, uint64 size);
 
   // Saves the redirected URL to final_url_, we need to use the original
   // URL to match original request.
   virtual bool OnRequestRedirected(int request_id, const GURL& url,
                                    ResourceResponse* response, bool* defer);
 
@@ skipping 30 matching lines @@
   virtual ~SaveFileResourceHandler();
 
   int save_id_;
   int render_process_id_;
   int render_view_id_;
   scoped_refptr<net::IOBuffer> read_buffer_;
   std::string content_disposition_;
   GURL url_;
   GURL final_url_;
   int64 content_length_;
+  FilePath default_download_dir_;
   SaveFileManager* save_manager_;
 
   static const int kReadBufSize = 32768;  // bytes
 
   DISALLOW_COPY_AND_ASSIGN(SaveFileResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_SAVE_FILE_RESOURCE_HANDLER_H_