Timeline: make prepareHighlightedEntryInfo return ?Promise<!Element>

third_party/WebKit/Source/devtools/front_end/profiler/CPUProfileFlameChart.js

 /**
  * Copyright (C) 2014 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 120 matching lines @@
      * @return {!WebInspector.FlameChart.TimelineData}
      */
     _calculateTimelineData: function()
     {
         throw "Not implemented.";
     },
 
     /**
      * @override
      * @param {number} entryIndex
-     * @return {?Array<!{title: string, value: (string|!Element)}>}
+     * @return {?Element}
      */
     prepareHighlightedEntryInfo: function(entryIndex)
     {
         throw "Not implemented.";
     },
 
     /**
      * @override
      * @param {number} entryIndex
      * @return {boolean}
@@ skipping 514 matching lines @@
     {
         var ratio = window.devicePixelRatio;
         this._overviewCanvas.width = width * ratio;
         this._overviewCanvas.height = height * ratio;
         this._overviewCanvas.style.width = width + "px";
         this._overviewCanvas.style.height = height + "px";
     },
 
     __proto__: WebInspector.VBox.prototype
 }