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

chrome/browser/tab_contents/background_contents.cc

 // 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.
 
 #include "chrome/browser/tab_contents/background_contents.h"
 
 #include "chrome/browser/background_contents_service.h"
 #include "chrome/browser/desktop_notification_handler.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
@@ skipping 91 matching lines @@
       NotificationType::BACKGROUND_CONTENTS_NAVIGATED,
       Source<Profile>(profile),
       Details<BackgroundContents>(this));
 }
 
 void BackgroundContents::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) {
   // TODO(rafaelw): Implement, The JavaScriptModalDialog needs to learn about
   // BackgroundContents.
   *did_suppress_message = true;
 }
 
 bool BackgroundContents::PreHandleKeyboardEvent(
     const NativeWebKeyboardEvent& event,
     bool* is_keyboard_shortcut) {
@@ skipping 138 matching lines @@
 BackgroundContents*
 BackgroundContents::GetBackgroundContentsByID(int render_process_id,
                                               int render_view_id) {
   RenderViewHost* render_view_host =
       RenderViewHost::FromID(render_process_id, render_view_id);
   if (!render_view_host)
     return NULL;
 
   return render_view_host->delegate()->GetAsBackgroundContents();
 }