DevTools: follow up to r168290, fix presentation model properties.

Source/devtools/front_end/TimelineView.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 486 matching lines @@
         var graphRowElement = this._graphRowsElement.firstChild;
         var scheduleRefreshCallback = this._invalidateAndScheduleRefresh.bind(this, true, true);
         var selectRecordCallback = this._selectRecord.bind(this);
         this._itemsGraphsElement.removeChild(this._expandElements);
         this._expandElements.removeChildren();
 
         for (var i = 0; i < endIndex; ++i) {
             var record = recordsInWindow[i];
 
             if (i < startIndex) {
-                var lastChildIndex = i + record.visibleChildrenCount;
+                var lastChildIndex = i + record.visibleChildrenCount();
                 if (lastChildIndex >= startIndex && lastChildIndex < endIndex) {
                     var expandElement = new WebInspector.TimelineExpandableElement(this._expandElements);
                     var positions = this._calculator.computeBarGraphWindowPosition(record);
                     expandElement._update(record, i, positions.left - this._expandOffset, positions.width);
                 }
             } else {
                 if (!listRowElement) {
                     listRowElement = new WebInspector.TimelineRecordListRow(this._linkifier, selectRecordCallback, scheduleRefreshCallback).element;
                     this._sidebarListElement.appendChild(listRowElement);
                 }
@@ skipping 706 matching lines @@
     this._arrow = this._element.createChild("div", "timeline-expandable-arrow");
 }
 
 WebInspector.TimelineExpandableElement.prototype = {
     /**
      * @param {!WebInspector.TimelinePresentationModel.Record} record
      */
     _update: function(record, index, left, width)
     {
         const rowHeight = WebInspector.TimelinePanel.rowHeight;
-        if (record.visibleChildrenCount || record.expandable) {
+        if (record.visibleChildrenCount() || record.expandable()) {
             this._element.style.top = index * rowHeight + "px";
             this._element.style.left = left + "px";
             this._element.style.width = Math.max(12, width + 25) + "px";
             if (!record.collapsed()) {
-                this._element.style.height = (record.visibleChildrenCount + 1) * rowHeight + "px";
+                this._element.style.height = (record.visibleChildrenCount() + 1) * rowHeight + "px";
                 this._element.classList.add("timeline-expandable-expanded");
                 this._element.classList.remove("timeline-expandable-collapsed");
             } else {
                 this._element.style.height = rowHeight + "px";
                 this._element.classList.add("timeline-expandable-collapsed");
                 this._element.classList.remove("timeline-expandable-expanded");
             }
             this._element.classList.remove("hidden");
         } else
             this._element.classList.add("hidden");
     },
 
     _dispose: function()
     {
         this._element.remove();
     }
 }