Timeline: remove TimelineModel inferred properties from TracingModel.Event

third_party/WebKit/Source/devtools/front_end/timeline_model/TimelineProfileTree.js

 // Copyright 2016 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.
 WebInspector.TimelineProfileTree = {};
 
 /**
  * @unrestricted
  */
 WebInspector.TimelineProfileTree.Node = class {
   constructor() {
@@ skipping 180 matching lines @@
   return null;
 };
 
 /**
  * @param {!WebInspector.TracingModel.Event} event
  * @return {?Protocol.Runtime.CallFrame}
  */
 WebInspector.TimelineProfileTree.eventStackFrame = function(event) {
   if (event.name === WebInspector.TimelineModel.RecordType.JSFrame)
     return /** @type {?Protocol.Runtime.CallFrame} */ (event.args['data'] || null);
-  var topFrame = event.stackTrace && event.stackTrace[0];
-  if (topFrame)
-    return /** @type {!Protocol.Runtime.CallFrame} */ (topFrame);
-  var initiator = event.initiator;
-  return /** @type {?Protocol.Runtime.CallFrame} */ (initiator && initiator.stackTrace && initiator.stackTrace[0] || null);
+  return WebInspector.TimelineData.forEvent(event).topFrame();
 };
 
 /**
  * @unrestricted
  */
 WebInspector.TimelineAggregator = class {
   /**
    * @param {function(!WebInspector.TracingModel.Event):string} titleMapper
    * @param {function(!WebInspector.TracingModel.Event):string} categoryMapper
    */
@@ skipping 143 matching lines @@
   EventName: 'EventName',
   Category: 'Category',
   Domain: 'Domain',
   Subdomain: 'Subdomain',
   URL: 'URL'
 };
 
 
 WebInspector.TimelineAggregator._extensionInternalPrefix = 'extensions::';
 WebInspector.TimelineAggregator._groupNodeFlag = Symbol('groupNode');