Specs: update the run loop and timer stuff to use the new model with task filters, priorities, and …

sky/specs/elements.md

 Sky DOM APIs
 ============
 
 ```dart
 SKY MODULE
 <!-- part of dart:sky -->
 
 <script>
 // ELEMENT TREE API
 
@@ skipping 361 matching lines @@
   _ErrorElement._create();
 
   @override
   Type getLayoutManager() => _ErrorElementLayoutManager; // O(1)
 }
 
 class SelectorQuery {
   external SelectorQuery(String selector); // O(F()) where F() is the complexity of the selector
 
   external bool matches(Element element); // O(F())
-  external Element find(node root); // O(N*F())+O(M) where N is the number of descendants and M the average depth of the tree
+  external Element find(Node root); // O(N*F())+O(M) where N is the number of descendants and M the average depth of the tree
   external List<Element> findAll(Node root); // O(N*F())+O(N*M) where N is the number of descendants and M the average depth of the tree
   // find() and findAll() throw if the root is not one of the following:
   //  - Element
   //  - Fragment
   //  - Root
 }
 </script>
 ```