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

content/browser/tab_contents/background_contents.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_TAB_CONTENTS_BACKGROUND_CONTENTS_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_BACKGROUND_CONTENTS_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 54 matching lines @@
   virtual ViewType::Type GetRenderViewType() const;
   virtual int GetBrowserWindowID() const;
   virtual void DidNavigate(RenderViewHost* render_view_host,
                            const ViewHostMsg_FrameNavigate_Params& params);
   virtual WebPreferences GetWebkitPrefs();
   virtual void ProcessWebUIMessage(const ViewHostMsg_DomMessage_Params& params);
   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 Close(RenderViewHost* render_view_host);
   virtual RendererPreferences GetRendererPrefs(Profile* profile) const;
   virtual void RenderViewGone(RenderViewHost* rvh,
                               base::TerminationStatus status,
                               int error_code);
   virtual bool OnMessageReceived(const IPC::Message& message);
 
   // RenderViewHostDelegate::View
@@ skipping 92 matching lines @@
   BackgroundContents* contents;
 
   // The name of the parent frame for these contents.
   const string16& frame_name;
 
   // The ID of the parent application (if any).
   const string16& application_id;
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_BACKGROUND_CONTENTS_H_