adding HtmlEscape to dart:convert

tests/lib/convert/line_splitter_test.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.
 
 library line_splitter_test;
 import "package:expect/expect.dart";
 import 'dart:async';
 import 'dart:convert';
 import 'dart:math' as MATH;
 
@@ skipping 65 matching lines @@
   result = decoder.convert(test);
 
   Expect.listEquals(
       ['Line1', 'Line2', 'Line3', 'Line4', '', '', '', '', '', ''],
       result);
 }
 
 void testReadLine1() {
   var controller = new StreamController(sync: true);
   var stream = controller.stream
-      .transform(new Utf8Decoder())
-      .transform(new LineSplitter());
+      .transform(UTF8.decoder)
+      .transform(const LineSplitter());
 
   var stage = 0;
   var done = false;
 
   void stringData(line) {
     Expect.equals(stage, 0);
     Expect.equals("Line", line);
     stage++;
   }
 
   void streamClosed() {
     Expect.equals(1, stage);
     done = true;
   }
 
   stream.listen(
       stringData,
       onDone: streamClosed);
 
   // Note: codeUnits is fine. Text is ASCII.
   controller.add("Line".codeUnits);
   controller.close();
   Expect.isTrue(done, 'should be done by now');
 }
 
 void testReadLine2() {
   var controller = new StreamController(sync: true);
 
   var stream = controller.stream
-    .transform(new Utf8Decoder())
-    .transform(new LineSplitter());
+    .transform(UTF8.decoder)
+    .transform(const LineSplitter());
 
   var expectedLines = ['Line1', 'Line2','Line3', 'Line4',
                        '', '', '', '', '', '',
                        'Line5', 'Line6'];
 
   var index = 0;
 
   stream.listen((line) {
     Expect.equals(expectedLines[index++], line);
   });
 
   // Note: codeUnits is fine. Text is ASCII.
   controller.add("Line1\nLine2\r\nLine3\rLi".codeUnits);
   controller.add("ne4\n".codeUnits);
   controller.add("\n\n\r\n\r\n\r\r".codeUnits);
   controller.add("Line5\r".codeUnits);
   controller.add("\nLine6\n".codeUnits);
   controller.close();
   Expect.equals(expectedLines.length, index);
 }