Fix inconsistent frame detach behavior of ContainerNode::parserRemoveChild.

Source/core/dom/ContainerNode.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, 2008, 2009, 2013 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 581 matching lines @@
 }
 
 void ContainerNode::parserRemoveChild(Node& oldChild)
 {
     ASSERT(oldChild.parentNode() == this);
     ASSERT(!oldChild.isDocumentFragment());
 
     Node* prev = oldChild.previousSibling();
     Node* next = oldChild.nextSibling();
 
-    oldChild.updateAncestorConnectedSubframeCountForRemoval();
+    if (oldChild.connectedSubframeCount())
+        ChildFrameDisconnector(oldChild).disconnect();
 
     ChildListMutationScope(*this).willRemoveChild(oldChild);
     oldChild.notifyMutationObserversNodeWillDetach();
 
     removeBetween(prev, next, oldChild);
 
     notifyNodeRemoved(oldChild);
     childrenChanged(ChildrenChange::forRemoval(oldChild, prev, next, ChildrenChangeSourceParser));
 }
 
@@ skipping 851 matching lines @@
         return true;
 
     if (node->isElementNode() && toElement(node)->shadow())
         return true;
 
     return false;
 }
 #endif
 
 } // namespace blink