Use the user's preferred downloads directory for creating the initial download file.

content/browser/download/download_manager_impl.cc

 // Copyright (c) 2012 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 "content/browser/download/download_manager_impl.h"
 
 #include <iterator>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 355 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // |bound_net_log| will be used for logging both the download item's and
   // the download file's events.
   net::BoundNetLog bound_net_log = CreateDownloadItem(info.get());
 
   // If info->download_id was unknown on entry to this function, it was
   // assigned in CreateDownloadItem.
   DownloadId download_id = info->download_id;
 
+  if (delegate_) {
+    FilePath website_save_directory;      // Unused
+    bool skip_dir_check = false;          // Unused
+    delegate_->GetSaveDir(GetBrowserContext(), &website_save_directory,
+                          &info->default_download_directory, &skip_dir_check);
+  }
+
   DownloadFileManager::CreateDownloadFileCallback callback(
       base::Bind(&DownloadManagerImpl::OnDownloadFileCreated,
                  this, download_id.local()));
 
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&DownloadFileManager::CreateDownloadFile,
                  file_manager_, base::Passed(info.Pass()),
                  base::Passed(stream.Pass()), make_scoped_refptr(this),
                  (delegate_ && delegate_->GenerateFileHash()), bound_net_log,
@@ skipping 674 matching lines @@
 void DownloadManagerImpl::DownloadRenamedToFinalName(
     DownloadItemImpl* download) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   // If the rename failed, we receive an OnDownloadInterrupted() call before we
   // receive the DownloadRenamedToFinalName() call.
   if (delegate_) {
     delegate_->UpdatePathForItemInPersistentStore(
         download, download->GetFullPath());
   }
 }