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

Source/WebCore/rendering/RenderText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 1447 matching lines @@
 {
     ASSERT(text);
 
     if (!force && equal(m_text.impl(), text.get()))
         return;
 
     setTextInternal(text);
     setNeedsLayoutAndPrefWidthsRecalc();
     m_knownToHaveNoOverflowAndNoFallbackFonts = false;
     
-    if (AXObjectCache* cache = document()->existingAXObjectCache())
-        cache->textChanged(this);
+    AXObjectCache* axObjectCache = document()->axObjectCache();
+    if (axObjectCache->accessibilityEnabled())
+        axObjectCache->textChanged(this);
 }
 
 String RenderText::textWithoutTranscoding() const
 {
     // If m_text isn't transcoded or is secure, we can just return the modified text.
     if (!m_needsTranscoding || style()->textSecurity() != TSNONE)
         return text();
 
     // Otherwise, we should use original text. If text-transform is
     // specified, we should transform the text on the fly.
@@ skipping 453 matching lines @@
 void RenderText::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::Rendering);
     RenderObject::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_text, "text");
     info.addMember(m_firstTextBox, "firstTextBox");
     info.addMember(m_lastTextBox, "lastTextBox");
 }
 
 } // namespace WebCore