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 191 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();
 };
 
 /**
  * @param {!WebInspector.TracingModel.Event} event
  * @return {string}
  */
 WebInspector.TimelineProfileTree._eventId = function(event) {
   if (event.name === WebInspector.TimelineModel.RecordType.JSFrame) {
     var data = event.args['data'];
     return 'f:' + data['functionName'] + '@' + (data['scriptId'] || data['url'] || '');
@@ skipping 50 matching lines @@
     groupNode.totalTime = 0;
     groupNode.children = new Map();
     groupNode.event = event;
     groupNode._isGroupNode = true;
     this._groupNodes.set(id, groupNode);
     return groupNode;
   }
 };
 
 WebInspector.TimelineAggregator._groupNodeFlag = Symbol('groupNode');