Report precise memory usage from StaticNodeList to v8

Source/core/dom/StaticNodeList.h

Index: Source/core/dom/StaticNodeList.h
diff --git a/Source/core/dom/StaticNodeList.h b/Source/core/dom/StaticNodeList.h
index dca6b59bfb207701e746ae6829918cb126ca97a2..62e22e8be770aa85dd08ca760496ae7ae077678b 100644
--- a/Source/core/dom/StaticNodeList.h
+++ b/Source/core/dom/StaticNodeList.h
@@ -56,10 +56,6 @@ public:
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
-    // If AllocationSize() is larger than this, we report it as external
-    // allocated memory to V8.
-    const static ptrdiff_t externalMemoryReportSizeLimit = 1024;
-
     ptrdiff_t AllocationSize()
     {
         return m_nodes.capacity() * sizeof(RefPtrWillBeMember<Node>);