Refresh dom_frog.

client/dom/generated/src/interface/Document.dart

 // Copyright (c) 2012, 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.
 
 // WARNING: Do not edit - generated code.
 
 interface Document extends Node, NodeSelector {
 
   final String URL;
 
@@ skipping 106 matching lines @@
   TouchList createTouchList();
 
   TreeWalker createTreeWalker(Node root, int whatToShow, NodeFilter filter, bool expandEntityReferences);
 
   Element elementFromPoint(int x, int y);
 
   XPathResult evaluate(String expression, Node contextNode, XPathNSResolver resolver, int type, XPathResult inResult);
 
   bool execCommand(String command, bool userInterface, String value);
 
-  Object getCSSCanvasContext(String contextId, String name, int width, int height);
+  CanvasRenderingContext getCSSCanvasContext(String contextId, String name, int width, int height);
 
   Element getElementById(String elementId);
 
   NodeList getElementsByClassName(String tagname);
 
   NodeList getElementsByName(String elementName);
 
   NodeList getElementsByTagName(String tagname);
 
   NodeList getElementsByTagNameNS(String namespaceURI, String localName);
@@ skipping 15 matching lines @@
   String queryCommandValue(String command);
 
   Element querySelector(String selectors);
 
   NodeList querySelectorAll(String selectors);
 
   void webkitCancelFullScreen();
 
   WebKitNamedFlow webkitGetFlowByName(String name);
 }