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 1e0d9ff4d94ba3a2b715824b1d6f8ec6c518e108..3b77ddc0293371f09d9d80427d15e8b5bf96fd52 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();