[DevTools] Do not expose agents on Target

third_party/WebKit/Source/devtools/front_end/accessibility/AccessibilityModel.js

 // Copyright (c) 2014 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.AccessibilityNode = class {
   /**
    * @param {!Accessibility.AccessibilityModel} accessibilityModel
    * @param {!Protocol.Accessibility.AXNode} payload
@@ skipping 208 matching lines @@
     return string;
   }
 };
 
 /**
  * @unrestricted
  */
 Accessibility.AccessibilityModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
+   * @param {!Protocol.Dispatcher} dispatcher
    */
-  constructor(target) {
-    super(target);
-    this._agent = target.accessibilityAgent();
+  constructor(target, dispatcher) {
+    super(target, dispatcher);
+    this._agent = dispatcher.accessibilityAgent();
 
     /** @type {!Map<string, !Accessibility.AccessibilityNode>} */
     this._axIdToAXNode = new Map();
     this._backendDOMNodeIdToAXNode = new Map();
   }
 
   clear() {
     this._axIdToAXNode.clear();
   }
 
@@ skipping 67 matching lines @@
    */
   logTree(inspectedNode) {
     var rootNode = inspectedNode;
     while (rootNode.parentNode())
       rootNode = rootNode.parentNode();
     console.log(rootNode.printSelfAndChildren(inspectedNode));  // eslint-disable-line no-console
   }
 };
 
 SDK.SDKModel.register(Accessibility.AccessibilityModel, SDK.Target.Capability.DOM, false);