Fix leaking AXNodeObjects when sub document detaches

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 2219 matching lines @@
         if (frameHost())
             frameHost()->chromeClient().focusedNodeChanged(oldFocusedElement.get(), nullptr);
     }
 
     if (this == &axObjectCacheOwner())
         clearAXObjectCache();
 
     m_layoutView = nullptr;
     ContainerNode::detach(context);
 
+    if (this != &axObjectCacheOwner()) {
+        if (AXObjectCache* cache = existingAXObjectCache()) {
+            // Documents that are not a root document use the AXObjectCache in
+            // their root document. Node::removedFrom is called after the
+            // document has been detached so it can't find the root document.
+            // We do the removals here instead.
+            for (Node& node : NodeTraversal::descendantsOf(*this)) {
+                cache->remove(&node);
+            }
+        }
+    }
+
     styleEngine().didDetach();
 
     frameHost()->eventHandlerRegistry().documentDetached(*this);
 
     m_frame->inputMethodController().documentDetached();
 
     // If this Document is associated with a live DocumentLoader, the
     // DocumentLoader will take care of clearing the FetchContext. Deferring
     // to the DocumentLoader when possible also prevents prematurely clearing
     // the context in the case where multiple Documents end up associated with
@@ skipping 3572 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     Document::WeakDocumentSet& set = Document::liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif