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

chrome/browser/download/chrome_download_manager_delegate.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 "chrome/browser/download/chrome_download_manager_delegate.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 493 matching lines @@
 }
 
 void ChromeDownloadManagerDelegate::RemoveItemsFromPersistentStoreBetween(
     base::Time remove_begin,
     base::Time remove_end) {
   if (profile_->IsOffTheRecord())
     return;
   download_history_->RemoveEntriesBetween(remove_begin, remove_end);
 }
 
-void ChromeDownloadManagerDelegate::GetSaveDir(WebContents* web_contents,
+void ChromeDownloadManagerDelegate::GetSaveDir(BrowserContext* browser_context,
                                                FilePath* website_save_dir,
                                                FilePath* download_save_dir,
                                                bool* skip_dir_check) {
-  Profile* profile =
-      Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  Profile* profile = Profile::FromBrowserContext(browser_context);
   PrefService* prefs = profile->GetPrefs();
 
   // Check whether the preference has the preferred directory for saving file.
   // If not, initialize it with default directory.
   if (!prefs->FindPreference(prefs::kSaveFileDefaultDirectory)) {
     DCHECK(prefs->FindPreference(prefs::kDownloadDefaultDirectory));
     FilePath default_save_path = prefs->GetFilePath(
         prefs::kDownloadDefaultDirectory);
     prefs->RegisterFilePathPref(prefs::kSaveFileDefaultDirectory,
                                 default_save_path,
@@ skipping 358 matching lines @@
     int32 download_id, int64 db_handle) {
   // It's not immediately obvious, but HistoryBackend::CreateDownload() can
   // call this function with an invalid |db_handle|. For instance, this can
   // happen when the history database is offline. We cannot have multiple
   // DownloadItems with the same invalid db_handle, so we need to assign a
   // unique |db_handle| here.
   if (db_handle == DownloadItem::kUninitializedHandle)
     db_handle = download_history_->GetNextFakeDbHandle();
   download_manager_->OnItemAddedToPersistentStore(download_id, db_handle);
 }