ChromeFrame tabs would hang at times while closing. This would randomly occur...

chrome_frame/chrome_frame_automation.cc

 // Copyright (c) 2010 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_frame/chrome_frame_automation.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/trace_event.h"
@@ skipping 1215 matching lines @@
 
   automation_server_->Send(
       new AutomationMsg_SetPageFontSize(0, tab_handle_, font_size));
 }
 
 void ChromeFrameAutomationClient::RemoveBrowsingData(int remove_mask) {
   automation_server_->Send(
       new AutomationMsg_RemoveBrowsingData(0, remove_mask));
 }
 
+void ChromeFrameAutomationClient::RunUnloadHandlers(HWND notification_window,
+                                                    int notification_message) {
+  automation_server_->Send(
+      new AutomationMsg_RunUnloadHandlers(0, tab_handle_, notification_window,
+                                          notification_message));
+}
+
 //////////////////////////////////////////////////////////////////////////
 // PluginUrlRequestDelegate implementation.
 // Forward network related responses to Chrome.
 
 void ChromeFrameAutomationClient::OnResponseStarted(int request_id,
     const char* mime_type,  const char* headers, int size,
     base::Time last_modified, const std::string& redirect_url,
     int redirect_status) {
   const IPC::AutomationURLResponse response = {
       mime_type,
@@ skipping 18 matching lines @@
     const URLRequestStatus& status) {
   automation_server_->Send(new AutomationMsg_RequestEnd(0, tab_->handle(),
       request_id, status));
 }
 
 void ChromeFrameAutomationClient::OnCookiesRetrieved(bool success,
     const GURL& url, const std::string& cookie_string, int cookie_id) {
   automation_server_->Send(new AutomationMsg_GetCookiesHostResponse(0,
       tab_->handle(), success, url, cookie_string, cookie_id));
 }