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

Source/WebCore/html/HTMLTextFormControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.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 516 matching lines @@
     return m_lastChangeWasUserEdit;
 }
 
 void HTMLTextFormControlElement::setInnerTextValue(const String& value)
 {
     if (!isTextFormControl())
         return;
 
     bool textIsChanged = value != innerTextValue();
     if (textIsChanged || !innerTextElement()->hasChildNodes()) {
-        if (textIsChanged && document() && renderer()) {
-            if (AXObjectCache* cache = document()->existingAXObjectCache())
-                cache->postNotification(this, AXObjectCache::AXValueChanged, false);
-        }
+        if (textIsChanged && document() && renderer() && AXObjectCache::accessibilityEnabled())
+            document()->axObjectCache()->postNotification(this, AXObjectCache::AXValueChanged, false);
+
         innerTextElement()->setInnerText(value, ASSERT_NO_EXCEPTION);
 
         if (value.endsWith('\n') || value.endsWith('\r'))
             innerTextElement()->appendChild(HTMLBRElement::create(document()), ASSERT_NO_EXCEPTION);
     }
 
     setFormControlValueMatchesRenderer(true);
 }
 
 static String finishText(StringBuilder& result)
@@ skipping 126 matching lines @@
 }
 
 void HTMLTextFormControlElement::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::DOM);
     HTMLFormControlElementWithState::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_textAsOfLastFormControlChangeEvent, "textAsOfLastFormControlChangeEvent");
 }
 
 } // namespace Webcore