Remove frame disconnection counter updating in removeDetachedChildren()

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 427e089656ad09e4104b4bd8a2f08822764e1101..c8c7ec052dcec662753ded4ecc35a49780439c3c 100644
--- a/Source/core/dom/ContainerNode.cpp
+++ b/Source/core/dom/ContainerNode.cpp
@@ -74,10 +74,7 @@ static void collectChildrenAndRemoveFromOldParent(Node& node, NodeVector& nodes,
 #if !ENABLE(OILPAN)
 void ContainerNode::removeDetachedChildren()
 {
-    if (connectedSubframeCount()) {
-        for (Node* child = firstChild(); child; child = child->nextSibling())
-            child->updateAncestorConnectedSubframeCountForRemoval();
-    }
+    ASSERT(!connectedSubframeCount());
     ASSERT(needsAttach());
     removeDetachedChildrenInContainer<Node, ContainerNode>(*this);
 }