Timeline: fix reset logic of TracingTimelineModel & co

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 691 matching lines @@
         return true;
     },
 
     _garbageCollectButtonClicked: function()
     {
         HeapProfilerAgent.collectGarbage();
     },
 
     _onClearButtonClick: function()
     {
+        if (this._tracingModel)
+            this._tracingModel.reset();
         this._model.reset();
     },
 
     _onRecordsCleared: function()
     {
         this.requestWindowTimes(0, Infinity);
         delete this._selection;
         if (this._lazyFrameModel)
             this._lazyFrameModel.reset();
         for (var i = 0; i < this._currentViews.length; ++i)
@@ skipping 694 matching lines @@
      * @param {!WebInspector.TimelineModel.Record} record
      * @return {boolean}
      */
     accept: function(record)
     {
         return !this._hiddenRecords[record.type()];
     },
 
     __proto__: WebInspector.TimelineModel.Filter.prototype
 }