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

Source/WebCore/editing/Editor.cpp

Index: Source/WebCore/editing/Editor.cpp
===================================================================
--- Source/WebCore/editing/Editor.cpp	(revision 146890)
+++ Source/WebCore/editing/Editor.cpp	(working copy)
@@ -549,8 +549,8 @@
 {
     if (AXObjectCache::accessibilityEnabled()) {
         Node* node = endingSelection.start().deprecatedNode();
-        if (AXObjectCache* cache = m_frame->document()->existingAXObjectCache())
-            cache->postNotification(node, AXObjectCache::AXValueChanged, false);
+        if (node)
+            m_frame->document()->axObjectCache()->postNotification(node, AXObjectCache::AXValueChanged, false);
     }
 
     updateMarkersForWordsAffectedByEditing(true);
@@ -2273,9 +2273,9 @@
                 RefPtr<Range> newParagraphRange = TextIterator::rangeFromLocationAndLength(toContainerNode(root), paragraphStartIndex, paragraphLength + replacementLength - resultLength);
                 paragraph = TextCheckingParagraph(TextIterator::subrange(newParagraphRange.get(), resultLocation, replacementLength), newParagraphRange);
                 
-                if (AXObjectCache* cache = m_frame->document()->existingAXObjectCache()) {
+                if (AXObjectCache::accessibilityEnabled()) {
                     if (Element* root = m_frame->selection()->selection().rootEditableElement())
-                        cache->postNotification(root, AXObjectCache::AXAutocorrectionOccured, true);
+                        m_frame->document()->axObjectCache()->postNotification(root, AXObjectCache::AXAutocorrectionOccured, true);
                 }
 
                 selectionChanged = true;