remove memoryinstrumentation

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 fb2a9bce3f78a7e60dd2554e7240e1a321a4e42a..f3ab51f8f82b65c50a2dbc9d65b5c1a0974191d0 100644
--- a/Source/core/dom/ContainerNode.cpp
+++ b/Source/core/dom/ContainerNode.cpp
@@ -877,20 +877,6 @@ Node *ContainerNode::childNode(unsigned index) const
     return n;
 }
 
-void ContainerNode::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
-{
-    MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::DOM);
-    Node::reportMemoryUsage(memoryObjectInfo);
-    info.ignoreMember(m_firstChild);
-    info.ignoreMember(m_lastChild);
-
-    // Report child nodes as direct members to make them look like a tree in the snapshot.
-    NodeVector children;
-    getChildNodes(const_cast<ContainerNode*>(this), children);
-    for (size_t i = 0; i < children.size(); ++i)
-        info.addMember(children[i], "child");
-}
-
 static void dispatchChildInsertionEvents(Node* child)
 {
     if (child->isInShadowTree())