Revert 146726 "AXObjectCache gets recreated during document tear..."

Source/WebCore/editing/InsertNodeBeforeCommand.cpp

 /*
  * Copyright (C) 2005, 2008 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 39 matching lines @@
 
 void InsertNodeBeforeCommand::doApply()
 {
     ContainerNode* parent = m_refChild->parentNode();
     if (!parent || (m_shouldAssumeContentIsAlwaysEditable == DoNotAssumeContentIsAlwaysEditable && !parent->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable)))
         return;
     ASSERT(parent->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable));
 
     parent->insertBefore(m_insertChild.get(), m_refChild.get(), IGNORE_EXCEPTION, AttachLazily);
 
-    if (AXObjectCache* cache = document()->existingAXObjectCache())
-        cache->nodeTextChangeNotification(m_insertChild.get(), AXObjectCache::AXTextInserted, 0, m_insertChild->nodeValue());
+    if (AXObjectCache::accessibilityEnabled())
+        document()->axObjectCache()->nodeTextChangeNotification(m_insertChild.get(), AXObjectCache::AXTextInserted, 0, m_insertChild->nodeValue());
 }
 
 void InsertNodeBeforeCommand::doUnapply()
 {
     if (!m_insertChild->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable))
         return;
 
     // Need to notify this before actually deleting the text
-    if (AXObjectCache* cache = document()->existingAXObjectCache())
-        cache->nodeTextChangeNotification(m_insertChild.get(), AXObjectCache::AXTextDeleted, 0, m_insertChild->nodeValue());
+    if (AXObjectCache::accessibilityEnabled())
+        document()->axObjectCache()->nodeTextChangeNotification(m_insertChild.get(), AXObjectCache::AXTextDeleted, 0, m_insertChild->nodeValue());
 
     m_insertChild->remove(IGNORE_EXCEPTION);
 }
 
 #ifndef NDEBUG
 void InsertNodeBeforeCommand::getNodesInCommand(HashSet<Node*>& nodes)
 {
     addNodeAndDescendants(m_insertChild.get(), nodes);
     addNodeAndDescendants(m_refChild.get(), nodes);
 }
 #endif
 
 }