[analyzer] remove "auto-generated do not edit" comments

pkg/analyzer/lib/src/generated/testing/html_factory.dart

 // Copyright (c) 2014, 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.
 
-// This code was auto-generated, is not intended to be edited, and is subject to
-// significant change. Please see the README file for more information.
-
 library engine.testing.html_factory;
 
 import 'package:analyzer/src/generated/html.dart';
 
 /**
  * Utility methods to create HTML nodes.
  */
 @deprecated
 class HtmlFactory {
   static XmlAttributeNode attribute(String name, String value) {
@@ skipping 39 matching lines @@
   static Token stringToken(String value) {
     return new Token.con2(TokenType.STRING, 0, value);
   }
 
   static XmlTagNode tagNode(String name,
       [List<XmlAttributeNode> attributes = XmlAttributeNode.EMPTY_LIST]) {
     return new XmlTagNode(ltToken(), stringToken(name), attributes, sgtToken(),
         null, null, null, null);
   }
 }