Fixes possible crash if the window hosting a menu was closed while the

views/views_delegate.h

Index: views/views_delegate.h
diff --git a/views/views_delegate.h b/views/views_delegate.h
index 6fe7f74f91171a7d5cfae1077d3401bccd78dfdc..d78304c8fb3b7fbd1cf373d98ad6ea32eb5277f6 100644
--- a/views/views_delegate.h
+++ b/views/views_delegate.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved. Use of this
+// 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.
 
@@ -49,6 +49,11 @@ class ViewsDelegate {
   virtual HICON GetDefaultWindowIcon() const = 0;
 #endif
 
+  // AddRef/ReleaseRef are invoked while a menu is visible. They are used to
+  // ensure we don't attempt to exit while a menu is showing.
+  virtual void AddRef() = 0;
+  virtual void ReleaseRef() = 0;
+
   // The active ViewsDelegate used by the views system.
   static ViewsDelegate* views_delegate;
 };