Reshow the notification after validating dangerous download

chrome/browser/download/notification/download_notification_item.cc

 // Copyright 2015 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/notification/download_notification_item.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_item_model.h"
@@ skipping 131 matching lines @@
     return;
   }
 
   DownloadCommands::Command command = button_actions_->at(button_index);
   if (command != DownloadCommands::PAUSE &&
       command != DownloadCommands::RESUME) {
     CloseNotificationByUser();
   }
 
   DownloadCommands(item_).ExecuteCommand(command);
+
+  // Shows the notification again after clicking "Keep" on dangerous download.
+  if (command == DownloadCommands::KEEP)
+    UpdateNotificationData(ADD_NEW);
 }
 
 // DownloadItem::Observer methods
 void DownloadNotificationItem::OnDownloadUpdated(content::DownloadItem* item) {
   DCHECK_EQ(item, item_);
 
   UpdateNotificationData(UPDATE_EXISTING);
 }
 
 void DownloadNotificationItem::CloseNotificationByUser() {
@@ skipping 301 matching lines @@
   NOTREACHED();
   return base::string16();
 }
 
 Browser* DownloadNotificationItem::GetBrowser() {
   chrome::ScopedTabbedBrowserDisplayer browser_displayer(
       profile_, chrome::GetActiveDesktop());
   DCHECK(browser_displayer.browser());
   return browser_displayer.browser();
 }