Removed const from classes arrays in Observatory

runtime/observatory/lib/src/elements/script_view.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 script_view;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/context_ref.dart';
@@ skipping 118 matching lines @@
           new NavLibraryMenuElement(_isolate, _script.library, queue: _r.queue),
           new NavMenuElement('object', last: true, queue: _r.queue),
           new NavRefreshElement(queue: _r.queue)
               ..onRefresh.listen((e) async {
                 e.element.disabled = true;
                 _script = await _scripts.get(_isolate, _script.id);
                 _r.dirty();
               }),
           new NavNotifyElement(_notifications, queue: _r.queue)
         ],
-      new DivElement()..classes = const ['content-centered-big']
+      new DivElement()..classes = ['content-centered-big']
         ..children = [
           new HeadingElement.h2()..text = 'Script',
           new HRElement(),
           new ObjectCommonElement(_isolate, _script, _retainedSizes,
                                   _reachableSizes, _references, _retainingPaths,
                                   _instances, queue: _r.queue),
           new BRElement(),
           new DivElement()..classes = ['memberList']
             ..children = [
               new DivElement()..classes = ['memberItem']
                 ..children = [
                   new DivElement()..classes = ['memberName']
                     ..text = 'load time',
                   new DivElement()..classes = ['memberName']
                     ..text = '${_script.loadTime}'
                 ],
             ],
           new HRElement(),
           new ScriptInsetElement(_isolate, _script, _scripts, _instances,
                                  _events, currentPos: _pos, queue: _r.queue),
           new ViewFooterElement(queue: _r.queue)
         ]
     ];
   }
 }