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

content/browser/tab_contents/tab_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_TAB_CONTENTS_H_
 #define CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 935 matching lines @@
   virtual void DomOperationResponse(const std::string& json_string,
                                     int automation_id);
   virtual void ProcessWebUIMessage(const ViewHostMsg_DomMessage_Params& params);
   virtual void ProcessExternalHostMessage(const std::string& message,
                                           const std::string& origin,
                                           const std::string& target);
   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);
   virtual GURL GetAlternateErrorPageURL() const;
   virtual RendererPreferences GetRendererPrefs(Profile* profile) const;
   virtual WebPreferences GetWebkitPrefs();
@@ skipping 299 matching lines @@
   // (full-page plugins for now only) permissions.
   int content_restrictions_;
 
   // Were the contents of this tab previously prerendered?
   bool was_prerendered_;
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CONTENT_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_