Devtools: Use Event.deepPath as a function if available.

third_party/WebKit/Source/devtools/front_end/ui/Tooltip.js

 // Copyright (c) 2015 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
  * @param {!Document} doc
  */
 WebInspector.Tooltip = function(doc)
 {
@@ skipping 15 matching lines @@
     // Wait time before opening a tooltip.
     "OpeningDelay": 600
 }
 
 WebInspector.Tooltip.prototype = {
     /**
      * @param {!Event} event
      */
     _mouseMove: function(event)
     {
-        var path = event.deepPath ? event.deepPath : event.path;
+        var path = event.path;
         if (!path || event.buttons !== 0)
             return;
 
         if (this._anchorElement && path.indexOf(this._anchorElement) === -1)
             this._hide(false);
 
         for (var element of path) {
             if (element === this._anchorElement) {
                 return;
             } else if (element[WebInspector.Tooltip._symbol]) {
@@ skipping 149 matching lines @@
 
     /**
      * @param {!Element|string} x
      * @this {!Element}
      */
     set: function(x)
     {
         WebInspector.Tooltip.install(this, x);
     }
 });