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

chrome/browser/renderer_host/save_file_resource_handler.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/renderer_host/save_file_resource_handler.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "chrome/browser/download/save_file_manager.h"
 #include "content/browser/browser_thread.h"
 #include "net/base/io_buffer.h"
 #include "net/url_request/url_request_status.h"
 
-SaveFileResourceHandler::SaveFileResourceHandler(int render_process_host_id,
-                                                 int render_view_id,
-                                                 const GURL& url,
-                                                 SaveFileManager* manager)
+SaveFileResourceHandler::SaveFileResourceHandler(
+    int render_process_host_id,
+    int render_view_id,
+    const GURL& url,
+    const FilePath& default_download_dir,
+    SaveFileManager* manager)
     : save_id_(-1),
       render_process_id_(render_process_host_id),
       render_view_id_(render_view_id),
       url_(url),
       content_length_(0),
+      default_download_dir_(default_download_dir),
       save_manager_(manager) {
 }
 
 bool SaveFileResourceHandler::OnUploadProgress(int request_id,
                                                uint64 position,
                                                uint64 size) {
   return true;
 }
 
 bool SaveFileResourceHandler::OnRequestRedirected(int request_id,
@@ skipping 11 matching lines @@
   SaveFileCreateInfo* info = new SaveFileCreateInfo;
   info->url = url_;
   info->final_url = final_url_;
   info->total_bytes = content_length_;
   info->save_id = save_id_;
   info->render_process_id = render_process_id_;
   info->render_view_id = render_view_id_;
   info->request_id = request_id;
   info->content_disposition = content_disposition_;
   info->save_source = SaveFileCreateInfo::SAVE_FILE_FROM_NET;
+  info->default_download_dir = default_download_dir_;
+
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(save_manager_,
                         &SaveFileManager::StartSave,
                         info));
   return true;
 }
 
 bool SaveFileResourceHandler::OnWillStart(int request_id,
                                           const GURL& url,
@@ skipping 45 matching lines @@
 
 void SaveFileResourceHandler::OnRequestClosed() {
 }
 
 void SaveFileResourceHandler::set_content_length(
     const std::string& content_length) {
   base::StringToInt64(content_length, &content_length_);
 }
 
 SaveFileResourceHandler::~SaveFileResourceHandler() {}