DevTools: Remove target function from TimelineModel

Source/devtools/front_end/timeline/TracingTimelineModel.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
  * @param {!WebInspector.TracingModel} tracingModel
  * @param {!WebInspector.TimelineModel.Filter} recordFilter
  * @extends {WebInspector.TimelineModel}
  */
 WebInspector.TracingTimelineModel = function(tracingModel, recordFilter)
 {
-    WebInspector.TimelineModel.call(this, tracingModel.target());
+    WebInspector.TimelineModel.call(this);
     this._tracingModel = tracingModel;
     this._inspectedTargetEvents = [];
     this._recordFilter = recordFilter;
 
     this.reset();
 }
 
 WebInspector.TracingTimelineModel.RecordType = {
     Program: "Program",
     EventDispatch: "EventDispatch",
@@ skipping 579 matching lines @@
     {
         var initiator = this._event.initiator;
         return initiator ? initiator._timelineRecord : null;
     },
 
     /**
      * @return {!WebInspector.Target}
      */
     target: function()
     {
-        return this._model.target();
+        //FIXME: get it from this._event
+        return WebInspector.targetManager.targets()[0];
     },
 
     /**
      * @return {number}
      */
     selfTime: function()
     {
         return this._event.selfTime;
     },
 
@@ skipping 130 matching lines @@
     },
 
     /**
      * @return {!WebInspector.TimelineModel}
      */
     timelineModel: function()
     {
         return this._model;
     }
 }