DevTools: use target-based model accessors only.

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 1086 matching lines @@
 
         var startOffset = startTime - this._model.minimumRecordTime();
         var endOffset = endTime - this._model.minimumRecordTime();
         contentHelper.appendTextRow(WebInspector.UIString("Range"), WebInspector.UIString("%s \u2013 %s", Number.millisToString(startOffset), Number.millisToString(endOffset)));
         contentHelper.appendElementRow(WebInspector.UIString("Aggregated Time"), pieChart);
 
         for (var i = 0; i < this._overviewControls.length; ++i) {
             if (this._overviewControls[i] instanceof WebInspector.TimelinePowerOverview) {
                 var energy = this._overviewControls[i].calculateEnergy(startTime, endTime);
                 contentHelper.appendTextRow(WebInspector.UIString("Energy"), WebInspector.UIString("%.2f Joules", energy));
-                contentHelper.appendTextRow(WebInspector.UIString("Accuracy"), WebInspector.powerProfiler.getAccuracyLevel());
+                contentHelper.appendTextRow(WebInspector.UIString("Accuracy"), this._overviewControls[i].accuracyLevel());
                 break;
             }
         }
         this.showInDetails(contentHelper.element);
     },
 
     /**
      * @override
      * @param {?WebInspector.TimelineSelection} selection
      * @param {!WebInspector.TimelinePanel.DetailsTab=} preferredTab
@@ skipping 384 matching lines @@
 WebInspector.TimelinePanelFactory.prototype = {
     /**
      * @override
      * @return {!WebInspector.Panel}
      */
     createPanel: function()
     {
         return WebInspector.TimelinePanel.instance();
     }
 }