Removed const from classes arrays in Observatory

runtime/observatory/lib/src/elements/script_inset.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_inset_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:observatory/app.dart';
 import 'package:observatory/models.dart' as M;
@@ skipping 566 matching lines @@
           _annotations.add(new LocalVariableAnnotation(_isolate, _instances,
                                                        _r.queue, location,
                                                        variable['value']));
         }
       }
     }
   }
 
   ButtonElement _newRefreshButton() {
     var button = new ButtonElement();
-    button.classes = const ['refresh'];
+    button.classes = ['refresh'];
     button.onClick.listen((_) async {
       button.disabled = true;
       await _refresh();
       button.disabled = false;
     });
     button.title = 'Refresh coverage';
     button.text = '↺';
     return button;
   }
 
   ButtonElement _newToggleProfileButton() {
     ButtonElement button = new ButtonElement();
-    button.classes = _includeProfile ? const ['toggle-profile', 'enabled']
-                                     : const ['toggle-profile'];
+    button.classes = _includeProfile ? ['toggle-profile', 'enabled']
+                                     : ['toggle-profile'];
     button.title = 'Toggle CPU profile information';
     button.onClick.listen((_) async {
       _includeProfile = !_includeProfile;
       button.classes.toggle('enabled');
       button.disabled = true;
       _refresh();
       button.disabled = false;
     });
     button.text = '🔥';
     return button;
@@ skipping 725 matching lines @@
     if (self) {
       return selfTicks / sampleCount;
     } else {
       return totalTicks / sampleCount;
     }
   }
 
   bool isHot(bool self) => _percent(self) > kHotThreshold;
   bool isMedium(bool self) => _percent(self) > kMediumThreshold;
 }