Use the suggested name from an anchor's 'download' attribute.

chrome/browser/download/download_manager.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/download/download_manager.h"
 
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/i18n/case_conversion.h"
 #include "base/logging.h"
@@ skipping 340 matching lines @@
   if (!state.prompt_user_for_save_location) {
     if (UserScript::IsURLUserScript(download->GetURL(),
         download->mime_type()) ||
         (download->mime_type() == Extension::kMimeType)) {
       state.is_extension_install = true;
     }
   }
 
   if (state.force_file_name.empty()) {
     FilePath generated_name;
-    download_util::GenerateFileNameFromRequest(download->GetURL(),
-                                               download->content_disposition(),
-                                               download->referrer_charset(),
-                                               download->mime_type(),
+    download_util::GenerateFileNameFromRequest(*download,
                                                &generated_name);
 
     // Freeze the user's preference for showing a Save As dialog.  We're going
     // to bounce around a bunch of threads and we don't want to worry about race
     // conditions where the user changes this pref out from under us.
     if (download_prefs_->PromptForDownload()) {
       // But ignore the user's preference for the following scenarios:
       // 1) Extension installation. Note that we only care here about the case
       //    where an extension is installed, not when one is downloaded with
       //    "save as...".
@@ skipping 971 matching lines @@
     observed_download_manager_->RemoveObserver(this);
 }
 
 void DownloadManager::OtherDownloadManagerObserver::ModelChanged() {
   observing_download_manager_->NotifyModelChanged();
 }
 
 void DownloadManager::OtherDownloadManagerObserver::ManagerGoingDown() {
   observed_download_manager_ = NULL;
 }