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

content/browser/renderer_host/render_view_host.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_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 583 matching lines @@
                                          const std::string& origin,
                                          const std::string& target);
   void OnMsgSetTooltipText(const std::wstring& tooltip_text,
                            WebKit::WebTextDirection text_direction_hint);
   void OnMsgSelectionChanged(const std::string& text);
   void OnMsgPasteFromSelectionClipboard();
   void OnMsgRunJavaScriptMessage(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);
   void OnMsgRunBeforeUnloadConfirm(const GURL& frame_url,
                                    const std::wstring& message,
                                    IPC::Message* reply_msg);
   void OnMsgShowModalHTMLDialog(const GURL& url, int width, int height,
                                 const std::string& json_arguments,
                                 IPC::Message* reply_msg);
   void OnMsgStartDragging(const WebDropData& drop_data,
                           WebKit::WebDragOperationsMask operations_allowed,
                           const SkBitmap& image,
@@ skipping 120 matching lines @@
   // The termination status of the last render view that terminated.
   base::TerminationStatus render_view_termination_status_;
 
   // The enabled/disabled states of various commands.
   std::map<RenderViewCommand, CommandState> command_states_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHost);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_