Make dart:dom implementation types private so they don't muddle the docs.

client/dom/generated/src/frog/NodeIterator.dart

Index: client/dom/generated/src/frog/NodeIterator.dart
diff --git a/client/dom/generated/src/frog/NodeIterator.dart b/client/dom/generated/src/frog/NodeIterator.dart
index edd63187669a3c55bb92b30c0faf0210e637feb5..9b2a07373e53ce2b9a205fe1d610ce544e9ada00 100644
--- a/client/dom/generated/src/frog/NodeIterator.dart
+++ b/client/dom/generated/src/frog/NodeIterator.dart
@@ -1,21 +1,21 @@
 
-class NodeIteratorJs extends DOMTypeJs implements NodeIterator native "*NodeIterator" {
+class _NodeIteratorJs extends _DOMTypeJs implements NodeIterator native "*NodeIterator" {
 
   bool get expandEntityReferences() native "return this.expandEntityReferences;";
 
-  NodeFilterJs get filter() native "return this.filter;";
+  _NodeFilterJs get filter() native "return this.filter;";
 
   bool get pointerBeforeReferenceNode() native "return this.pointerBeforeReferenceNode;";
 
-  NodeJs get referenceNode() native "return this.referenceNode;";
+  _NodeJs get referenceNode() native "return this.referenceNode;";
 
-  NodeJs get root() native "return this.root;";
+  _NodeJs get root() native "return this.root;";
 
   int get whatToShow() native "return this.whatToShow;";
 
   void detach() native;
 
-  NodeJs nextNode() native;
+  _NodeJs nextNode() native;
 
-  NodeJs previousNode() native;
+  _NodeJs previousNode() native;
 }