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

chrome/browser/automation/automation_provider_win.cc

Index: chrome/browser/automation/automation_provider_win.cc
===================================================================
--- chrome/browser/automation/automation_provider_win.cc	(revision 52332)
+++ chrome/browser/automation/automation_provider_win.cc	(working copy)
@@ -590,3 +590,13 @@
     *status = AUTOMATION_MSG_NAVIGATION_SUCCESS;
   }
 }
+
+void AutomationProvider::OnRunUnloadHandlers(
+    int handle, gfx::NativeWindow notification_window,
+    int notification_message) {
+  ExternalTabContainer* external_tab = GetExternalTabForHandle(handle);
+  if (external_tab) {
+    external_tab->RunUnloadHandlers(notification_window, notification_message);
+  }
+}
+