[DevTools] Do not inherit ObjectPopoverHelper from PopoverHelper.

third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 562 matching lines @@
    * @return {!Element|!AnchorBox|undefined}
    */
   _getPopoverAnchor(element, event) {
     var link = element;
     while (link && !link[Elements.ElementsTreeElement.HrefSymbol])
       link = link.parentElementOrShadowHost();
     return link ? link : undefined;
   }
 
   /**
-   * @param {!Element} link
+   * @param {!Element|!AnchorBox} link
    * @param {!UI.GlassPane} popover
    * @return {!Promise<boolean>}
    */
   _showPopover(link, popover) {
     var node = this.selectedDOMNode();
     if (!node)
       return Promise.resolve(false);
 
     var fulfill;
     var promise = new Promise(x => fulfill = x);
@@ skipping 518 matching lines @@
    * @param {!SDK.DOMNode} node
    * @return {?{title: string, color: string}}
    */
   decorate(node) {
     return {
       color: 'orange',
       title: Common.UIString('Element state: %s', ':' + SDK.CSSModel.fromNode(node).pseudoState(node).join(', :'))
     };
   }
 };