Cleanup <static_cast>: Switch to toFoo for Accessibility Objects.

Source/core/accessibility/AccessibilityMenuListPopup.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 54 matching lines @@
 }
 
 AccessibilityMenuListOption* AccessibilityMenuListPopup::menuListOptionAccessibilityObject(HTMLElement* element) const
 {
     if (!element || !element->hasTagName(optionTag) || !element->attached())
         return 0;
 
     AccessibilityObject* object = document()->axObjectCache()->getOrCreate(MenuListOptionRole);
     ASSERT_WITH_SECURITY_IMPLICATION(object->isMenuListOption());
 
-    AccessibilityMenuListOption* option = static_cast<AccessibilityMenuListOption*>(object);
+    AccessibilityMenuListOption* option = toAccessibilityMenuListOption(object);
     option->setElement(element);
 
     return option;
 }
 
 bool AccessibilityMenuListPopup::press() const
 {
     if (!m_parent)
         return false;
 
@@ skipping 45 matching lines @@
     ASSERT_ARG(optionIndex, optionIndex < static_cast<int>(m_children.size()));
 
     AXObjectCache* cache = axObjectCache();
     RefPtr<AccessibilityObject> child = m_children[optionIndex].get();
 
     cache->postNotification(child.get(), document(), AXObjectCache::AXFocusedUIElementChanged, true, PostSynchronously);
     cache->postNotification(child.get(), document(), AXObjectCache::AXMenuListItemSelected, true, PostSynchronously);
 }
 
 } // namespace WebCore