Fix void foo(..) => ... to use { } instead.

sdk/lib/convert/html_escape.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;
 
 /**
  * A `String` converter that converts characters to HTML entities.
  *
  * This is intended to sanitice text before inserting the text into an HTML
@@ skipping 209 matching lines @@
   void addSlice(String chunk, int start, int end, bool isLast) {
     var val = _escape._convert(chunk, start, end);
     if(val == null) {
       _sink.addSlice(chunk, start, end, isLast);
     } else {
       _sink.add(val);
       if (isLast) _sink.close();
     }
   }
 
-  void close() => _sink.close();
+  void close() { _sink.close(); }
 }