DevTools: remove TimelineModel.Events.RecordAdded event

Source/devtools/front_end/timeline/TimelinePowerGraph.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.CountersGraph}
  * @implements {WebInspector.TimelineModeView}
  * @param {!WebInspector.TimelineModeViewDelegate} delegate
  * @param {!WebInspector.TimelineModel} model
@@ skipping 21 matching lines @@
             return;
         }
 
         // "value" of original PowerEvent means the average power between previous sampling to current one.
         // Here, it is converted to average power between current sampling to next one.
         this._counter.appendSample(this._previousRecord.timestamp, record.value);
         this._previousRecord = record;
         this.scheduleRefresh();
     },
 
-    /**
-     * @param {!WebInspector.TimelineModel.Record} record
-     */
-    addRecord: function(record)
-    {
-    },
-
     __proto__: WebInspector.CountersGraph.prototype
 }