| Index: tracing/tracing/ui/tracks/object_instance_group_track.html | 
| diff --git a/tracing/tracing/ui/tracks/object_instance_group_track.html b/tracing/tracing/ui/tracks/object_instance_group_track.html | 
| index 81e8a54b0eda0e01c2a87e000effb3452a82da66..7910ed1857a6ad40e2ad11e486f34a3b9a617d9f 100644 | 
| --- a/tracing/tracing/ui/tracks/object_instance_group_track.html | 
| +++ b/tracing/tracing/ui/tracks/object_instance_group_track.html | 
| @@ -30,7 +30,7 @@ tr.exportTo('tr.ui.tracks', function() { | 
|  | 
| decorate: function(viewport) { | 
| tr.ui.tracks.MultiRowTrack.prototype.decorate.call(this, viewport); | 
| -      this.classList.add('object-instance-group-track'); | 
| +      Polymer.dom(this).classList.add('object-instance-group-track'); | 
| this.objectInstances_ = undefined; | 
| }, | 
|  | 
|  |