[DevTools] Do not expose agents on Target

third_party/WebKit/Source/devtools/front_end/sdk/DOMDebuggerModel.js

 // Copyright 2017 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.
 
 SDK.DOMDebuggerModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
+   * @param {!Protocol.Dispatcher} dispatcher
    */
-  constructor(target) {
-    super(target);
-    this._agent = target.domdebuggerAgent();
+  constructor(target, dispatcher) {
+    super(target, dispatcher);
+    this._agent = dispatcher.domdebuggerAgent();
     this._runtimeModel = /** @type {!SDK.RuntimeModel} */ (target.model(SDK.RuntimeModel));
     this._domModel = /** @type {!SDK.DOMModel} */ (target.model(SDK.DOMModel));
     this._domModel.addEventListener(SDK.DOMModel.Events.DocumentUpdated, this._documentUpdated, this);
     this._domModel.addEventListener(SDK.DOMModel.Events.NodeRemoved, this._nodeRemoved, this);
 
     /** @type {!Array<!SDK.DOMDebuggerModel.DOMBreakpoint>} */
     this._domBreakpoints = [];
     this._domBreakpointsSetting = Common.settings.createLocalSetting('domBreakpoints', []);
     if (this._domModel.existingDocument())
       this._documentUpdated();
@@ skipping 813 matching lines @@
   /**
    * @override
    * @param {!SDK.DOMDebuggerModel} domDebuggerModel
    */
   modelRemoved(domDebuggerModel) {
   }
 };
 
 /** @type {!SDK.DOMDebuggerManager} */
 SDK.domDebuggerManager;