[DevTools] Do not inherit SDK.DOMNode from SDK.SDKObject

third_party/WebKit/Source/devtools/front_end/accessibility/AXTreePane.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.
 /**
  * @unrestricted
  */
 Accessibility.AXTreePane = class extends Accessibility.AccessibilitySubPane {
   /**
    * @param {!Accessibility.AccessibilitySidebarView} axSidebarView
    */
@@ skipping 164 matching lines @@
   }
 
   clearSelectedByUser() {
     delete this._selectedByUser;
   }
 
   /**
    * @return {!SDK.Target}
    */
   target() {
-    return this.node().target();
+    return this.node().domModel().target();
   }
 };
 
 /**
  * @unrestricted
  */
 Accessibility.AXNodeTreeElement = class extends UI.TreeElement {
   /**
    * @param {!Accessibility.AccessibilityNode} axNode
    * @param {!Accessibility.AXTreePane} treePane
@@ skipping 285 matching lines @@
 
     return super.select(omitFocus, selectedByUser);
   }
 };
 
 /** @type {!Object<string, string>} */
 Accessibility.AXNodeTreeElement.RoleStyles = {
   internalRole: 'ax-internal-role',
   role: 'ax-role',
 };