Advance html5lib to newest breaking changes in core: getKeys -> keys, etc

lib/dom.dart

 /**
  * A simple tree API that results from parsing html. Intended to be compatible
  * with dart:html, but right now it resembles the classic JS DOM.
  */
 library dom;
 
 import 'src/constants.dart';
 import 'src/list_proxy.dart';
 import 'src/treebuilder.dart';
 import 'src/utils.dart';
@@ skipping 70 matching lines @@
 
   /** The parent of the current node (or null for the document node). */
   Node parent;
 
   /**
    * A map holding name, value pairs for attributes of the node.
    *
    * Note that attribute order needs to be stable for serialization, so we use a
    * LinkedHashMap. Each key is a [String] or [AttributeName].
    */
-  LinkedHashMap<Dynamic, String> attributes = new LinkedHashMap();
+  LinkedHashMap<dynamic, String> attributes = new LinkedHashMap();
 
   /**
    * A list of child nodes of the current node. This must
    * include all elements but not necessarily other node types.
    */
   final NodeList nodes = new NodeList._();
 
   /**
    * The source span of this node, if it was created by the [HtmlParser].
    */
@@ skipping 381 matching lines @@
   void insertRange(int start, int rangeLength, [Node initialValue]) {
     if (initialValue == null) {
       throw new ArgumentError('cannot add null node.');
     }
     if (rangeLength > 1) {
       throw new UnsupportedError('cannot add the same node multiple times.');
     }
     super.insertRange(start, 1, _setParent(initialValue));
   }
 }