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

chrome/browser/automation/automation_provider.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/browser/automation/automation_provider.h"
 
 #include <set>
 
 #include "app/l10n_util.h"
 #include "app/message_box_flags.h"
@@ skipping 540 matching lines @@
     IPC_MESSAGE_HANDLER(AutomationMsg_NavigateInExternalTab,
                         NavigateInExternalTab)
     IPC_MESSAGE_HANDLER(AutomationMsg_NavigateExternalTabAtIndex,
                         NavigateExternalTabAtIndex)
     IPC_MESSAGE_HANDLER(AutomationMsg_ConnectExternalTab, ConnectExternalTab)
     IPC_MESSAGE_HANDLER(AutomationMsg_SetEnableExtensionAutomation,
                         SetEnableExtensionAutomation)
     IPC_MESSAGE_HANDLER(AutomationMsg_HandleMessageFromExternalHost,
                         OnMessageFromExternalHost)
     IPC_MESSAGE_HANDLER(AutomationMsg_BrowserMove, OnBrowserMoved)
+    IPC_MESSAGE_HANDLER(AutomationMsg_RunUnloadHandlers, OnRunUnloadHandlers)
 #endif  // defined(OS_WIN)
 #if defined(OS_CHROMEOS)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(AutomationMsg_LoginWithUserAndPass,
                                     LoginWithUserAndPass)
 #endif  // defined(OS_CHROMEOS)
   IPC_END_MESSAGE_MAP()
 }
 
 void AutomationProvider::ActivateTab(int handle, int at_index, int* status) {
   *status = -1;
@@ skipping 3323 matching lines @@
 }
 
 void AutomationProvider::WaitForPopupMenuToOpen(IPC::Message* reply_message) {
   NOTIMPLEMENTED();
 }
 #endif  // !defined(TOOLKIT_VIEWS)
 
 void AutomationProvider::ResetToDefaultTheme() {
   profile_->ClearTheme();
 }