Removed const from classes arrays in Observatory

runtime/observatory/lib/src/elements/flag_list.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 flag_list_element;
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
@@ skipping 118 matching lines @@
       _flags = flags;
       _r.dirty();
     });
   }
 
   static bool _isModified(M.Flag flag) => flag.modified;
   static bool _isUnmodified(M.Flag flag) => !flag.modified;
 
   static List<Element> _renderFlag(M.Flag flag) {
     return [
-      new SpanElement()..classes = const ['comment']
+      new SpanElement()..classes = ['comment']
         ..text = '// ${flag.comment}',
-      new DivElement()..classes = flag.modified ? const ['flag', 'modified']
-                                                : const ['flag', 'unmodified']
+      new DivElement()..classes = flag.modified ? ['flag', 'modified']
+                                                : ['flag', 'unmodified']
         ..children = [
-          new SpanElement()..classes = const ['name']
+          new SpanElement()..classes = ['name']
             ..text = flag.name,
           new SpanElement()..text = '=',
-          new SpanElement()..classes = const ['value']
+          new SpanElement()..classes = ['value']
             ..text = flag.valueAsString ?? 'NULL'
         ],
       new BRElement(),
     ];
   }
 }