Ignore JavaScript messages (alert/confirm/prompt) during unload handlers.

content/browser/renderer_host/render_view_host_delegate.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 494 matching lines @@
   // arbitrary string that makes sense to the receiver.
   virtual void ProcessExternalHostMessage(const std::string& message,
                                           const std::string& origin,
                                           const std::string& target) {}
 
   // A javascript message, confirmation or prompt should be shown.
   virtual void RunJavaScriptMessage(const std::wstring& message,
                                     const std::wstring& default_prompt,
                                     const GURL& frame_url,
                                     const int flags,
+                                    const bool unload_handler_being_run,
                                     IPC::Message* reply_msg,
                                     bool* did_suppress_message) {}
 
   virtual void RunBeforeUnloadConfirm(const std::wstring& message,
                                       IPC::Message* reply_msg) {}
 
   virtual void ShowModalHTMLDialog(const GURL& url, int width, int height,
                                    const std::string& json_arguments,
                                    IPC::Message* reply_msg) {}
 
@@ skipping 50 matching lines @@
                                 bool remember) {}
 
   // Notification that a worker process has crashed.
   void WorkerCrashed() {}
 
  protected:
   virtual ~RenderViewHostDelegate() {}
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_