Fix inconsistent frame detach behavior of ContainerNode::parserRemoveChild.

Source/core/dom/ContainerNode.cpp

Index: Source/core/dom/ContainerNode.cpp
diff --git a/Source/core/dom/ContainerNode.cpp b/Source/core/dom/ContainerNode.cpp
index 4b92caae4cce317d353bd732d6179bc908ba74b1..afb950178118d706f2a32e6d3f16ccc58556bce8 100644
--- a/Source/core/dom/ContainerNode.cpp
+++ b/Source/core/dom/ContainerNode.cpp
@@ -599,7 +599,8 @@ void ContainerNode::parserRemoveChild(Node& oldChild)
     Node* prev = oldChild.previousSibling();
     Node* next = oldChild.nextSibling();
 
-    oldChild.updateAncestorConnectedSubframeCountForRemoval();
+    if (oldChild.connectedSubframeCount())
+        ChildFrameDisconnector(oldChild).disconnect();
 
     ChildListMutationScope(*this).willRemoveChild(oldChild);
     oldChild.notifyMutationObserversNodeWillDetach();