Rename cloneNode to clone and move it into the Node interface.

client/html/src/NodeWrappingImplementation.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class _ChildrenNodeList implements NodeList {
   // Raw node.
   final _node;
   final _childNodes;
 
   _ChildrenNodeList._wrap(var node)
@@ skipping 193 matching lines @@
   }
 
   // TODO(jacobr): remove when/if List supports a method similar to
   // insertBefore or we switch NodeList to implement LinkedList rather than
   // array.
   Node insertBefore(Node newChild, Node refChild) {
     return LevelDom.wrapNode(_ptr.insertBefore(
         LevelDom.unwrap(newChild), LevelDom.unwrap(refChild)));
   }
 
-  // TODO(jacobr): required for some benchmarks. Added to this class but not Node while
-  // we decide what to do with it.
-  Node cloneNode(bool deep) {
+  Node clone(bool deep) {
     return LevelDom.wrapNode(_ptr.cloneNode(deep));
   }
 }