DevTools: use target-based model accessors only.

Source/devtools/front_end/sdk/PowerProfiler.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.Object}
  * @param {!WebInspector.Target} target
  */
 WebInspector.PowerProfiler = function(target)
@@ skipping 16 matching lines @@
     },
 
     stopProfile: function()
     {
         this._target.powerAgent().end();
     },
 
     /**
      * @return {string}
      */
-    getAccuracyLevel: function()
+    accuracyLevel: function()
     {
         return this._accuracyLevel;
     },
 
-    _onAccuracyLevel: function(error, result) {
+    _onAccuracyLevel: function(error, result)
+    {
         this._accuracyLevel = "";
         if (error) {
             console.log("Unable to retrieve PowerProfiler accuracy level: " + error);
             return;
         }
         this._accuracyLevel = result;
     },
 
     __proto__: WebInspector.Object.prototype
 }
@@ skipping 11 matching lines @@
     /**
      * @override
      * @param {!Array.<!PowerAgent.PowerEvent>} events
      */
     dataAvailable: function(events)
     {
         for (var i = 0; i < events.length; ++i)
             this._profiler.dispatchEventToListeners(WebInspector.PowerProfiler.EventTypes.PowerEventRecorded, events[i]);
     }
 }
-
-/**
- * @type {!WebInspector.PowerProfiler}
- */
-WebInspector.powerProfiler;