Uncomment and clean up all_the_rest.dart tests.

pkg/analyzer/lib/src/generated/html.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.html;
 
 import 'dart:collection';
@@ skipping 1947 matching lines @@
     if (identical(token, contentEnd)) {
       return "";
     }
     //TODO (danrubel): handle CDATA and replace HTML character encodings with the actual characters
     String content = token.lexeme;
     token = token.next;
     if (identical(token, contentEnd)) {
       return content;
     }
     JavaStringBuilder buffer = new JavaStringBuilder();
+    buffer.append(content);
     while (!identical(token, contentEnd)) {
       buffer.append(token.lexeme);
       token = token.next;
     }
     return buffer.toString();
   }
 
   @override
   Token get endToken {
     if (nodeEnd != null) {
@@ skipping 56 matching lines @@
  */
 abstract class XmlVisitor<R> {
   R visitHtmlScriptTagNode(HtmlScriptTagNode node);
 
   R visitHtmlUnit(HtmlUnit htmlUnit);
 
   R visitXmlAttributeNode(XmlAttributeNode xmlAttributeNode);
 
   R visitXmlTagNode(XmlTagNode xmlTagNode);
 }