| Index: tracing/tracing/ui/tracks/spacing_track.html | 
| diff --git a/tracing/tracing/ui/tracks/spacing_track.html b/tracing/tracing/ui/tracks/spacing_track.html | 
| index 583a4df8653f0abc7ab9818a880f1fc8fdf4377f..7b2fa2526274d0281a0f7e79c21ce4fa16425e18 100644 | 
| --- a/tracing/tracing/ui/tracks/spacing_track.html | 
| +++ b/tracing/tracing/ui/tracks/spacing_track.html | 
| @@ -27,7 +27,7 @@ tr.exportTo('tr.ui.tracks', function() { | 
|  | 
| decorate: function(viewport) { | 
| tr.ui.tracks.Track.prototype.decorate.call(this, viewport); | 
| -      this.classList.add('spacing-track'); | 
| +      Polymer.dom(this).classList.add('spacing-track'); | 
|  | 
| this.heading_ = document.createElement('tr-ui-heading'); | 
| Polymer.dom(this).appendChild(this.heading_); | 
|  |