adding HtmlEscape to dart:convert

sdk/lib/convert/line_splitter.dart

 // Copyright (c) 2013, 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.
 
 part of dart.convert;
 
 /**
  * This class splits [String] values into individual lines.
  */
 class LineSplitter extends Converter<String, List<String>> {
+
+  const LineSplitter();
+
   List<String> convert(String data) {
     var lines = new List<String>();
 
     _LineSplitterSink._addSlice(data, 0, data.length, true, lines.add);
 
     return lines;
   }
 
   StringConversionSink startChunkedConversion(
     ChunkedConversionSink<String> sink) {
@@ skipping 62 matching lines @@
       if (isLast) {
         // Add remaining
         adder(carry);
       } else {
         return carry;
       }
     }
     return null;
   }
 }