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

Source/WebCore/loader/FrameLoader.cpp

Index: Source/WebCore/loader/FrameLoader.cpp
===================================================================
--- Source/WebCore/loader/FrameLoader.cpp	(revision 146890)
+++ Source/WebCore/loader/FrameLoader.cpp	(working copy)
@@ -1120,9 +1120,9 @@
     m_client->dispatchDidStartProvisionalLoad();
 
     // Notify accessibility.
-    if (AXObjectCache* cache = m_frame->document()->existingAXObjectCache()) {
+    if (AXObjectCache::accessibilityEnabled()) {
         AXObjectCache::AXLoadingEvent loadingEvent = loadType() == FrameLoadTypeReload ? AXObjectCache::AXLoadingReloaded : AXObjectCache::AXLoadingStarted;
-        cache->frameLoadingEventNotification(m_frame, loadingEvent);
+        m_frame->document()->axObjectCache()->frameLoadingEventNotification(m_frame, loadingEvent);
     }
 }
 
@@ -2209,8 +2209,8 @@
             }
 
             // Notify accessibility.
-            if (AXObjectCache* cache = m_frame->document()->existingAXObjectCache())
-                cache->frameLoadingEventNotification(m_frame, loadingEvent);
+            if (AXObjectCache::accessibilityEnabled())
+                m_frame->document()->axObjectCache()->frameLoadingEventNotification(m_frame, loadingEvent);
 
             return;
         }