DevTools: Remove redundant dependency on target from TimelineFrameModel

Source/devtools/front_end/timeline/TracingModel.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.SDKObject}
  */
@@ skipping 449 matching lines @@
 {
     WebInspector.TracingModel.NamedObject.call(this);
     this._process = process;
     this._setName("Thread " + id);
     this._events = [];
     this._stack = [];
     this._maxStackDepth = 0;
 }
 
 WebInspector.TracingModel.Thread.prototype = {
+
+    /**
+     * @return {?WebInspector.Target}
+     */
+    target: function()
+    {
+        //FIXME: correctly specify target
+        return WebInspector.targetManager.targets()[0];
+    },
+
     /**
      * @param {!WebInspector.TracingModel.EventPayload} payload
      * @return {?WebInspector.TracingModel.Event} event
      */
     addEvent: function(payload)
     {
         for (var top = this._stack.peekLast(); top && top.endTime && top.endTime <= payload.ts / 1000;) {
             this._stack.pop();
             top = this._stack.peekLast();
         }
@@ skipping 71 matching lines @@
     dataCollected: function(data)
     {
         this._tracingModel._eventsCollected(data);
     },
 
     tracingComplete: function()
     {
         this._tracingModel._tracingComplete();
     }
 }