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

client/html/benchmarks/dromaeo/tests/DomModify.dart

 class Main {
   static void main() {
     final int num = 400;
 
     String str = 'null';
     // Very ugly way to build up the string, but let's mimic JS version as much as possible.
     for (int i = 0; i < 1024; i++) {
       str += new String.fromCharCodes([((25 * Math.random()) + 97).toInt()]);
     }
 
@@ skipping 26 matching lines @@
         .test('innerHTML', () {
           document.body.innerHTML = htmlstr;
         })
         .prep(() {
           elems = new Array<Node>();
           final telems = document.body.nodes;
           for (int i = 0; i < telems.length; i++) {
             elems.add(telems[i]);
           }
         })
-        .test('cloneNode', () {
+        .test('clone', () {
           for (int i = 0; i < elems.length; i++) {
             // not supported by Dart... this will intentionally throw an exception.
             // TODO(jacobr): find the right solution.
-            ret = elems[i].dynamic.cloneNode(false);
-            ret = elems[i].dynamic.cloneNode(true);
-            ret = elems[i].dynamic.cloneNode(true);
+            ret = elems[i].dynamic.clone(false);
+            ret = elems[i].dynamic.clone(true);
+            ret = elems[i].dynamic.clone(true);
           }
         })
         .test('appendChild', () {
           for (int i = 0; i < elems.length; i++)
             document.body.nodes.add(elems[i]);
         })
         .test('insertBefore', () {
           for (int i = 0; i < elems.length; i++)
             document.body.insertBefore(elems[i], document.body.nodes.first);
         })
         .end();
     });
   }
 }