Timeline: fix reset logic of TracingTimelineModel & co

Source/devtools/front_end/timeline/TimelineTracingView.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
  * @implements {WebInspector.TimelineModeView}
  * @implements {WebInspector.FlameChartDelegate}
@@ skipping 37 matching lines @@
     {
         return this;
     },
 
     dispose: function()
     {
     },
 
     reset: function()
     {
-        this._tracingModel.reset();
         this._dataProvider.reset();
         this._mainView.setWindowTimes(0, Infinity);
     },
 
     /**
      * @param {?RegExp} textFilter
      */
     refreshRecords: function(textFilter)
     {
         this._dataProvider.reset();
@@ skipping 504 matching lines @@
     /**
      * @param {string} string
      * @return {string}
      */
     colorForString: function(string)
     {
         var hash = WebInspector.TraceViewPalette._stringHash(string);
         return this._palette[hash % this._palette.length];
     }
 };