[DevTools] Do not expose agents on Target

third_party/WebKit/Source/devtools/front_end/sdk/OverlayModel.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.
 
 /**
  * @implements {Protocol.OverlayDispatcher}
  */
 SDK.OverlayModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
+   * @param {!Protocol.Dispatcher} dispatcher
    */
-  constructor(target) {
-    super(target);
+  constructor(target, dispatcher) {
+    super(target, dispatcher);
     this._domModel = /** @type {!SDK.DOMModel} */ (target.model(SDK.DOMModel));
 
-    target.registerOverlayDispatcher(this);
-    this._overlayAgent = target.overlayAgent();
+    dispatcher.registerOverlayDispatcher(this);
+    this._overlayAgent = dispatcher.overlayAgent();
     this._overlayAgent.enable();
     this._overlayAgent.setShowViewportSizeOnResize(true);
 
     this._debuggerModel = target.model(SDK.DebuggerModel);
     if (this._debuggerModel) {
       Common.moduleSetting('disablePausedStateOverlay').addChangeListener(this._updatePausedInDebuggerMessage, this);
       this._debuggerModel.addEventListener(
           SDK.DebuggerModel.Events.DebuggerPaused, this._updatePausedInDebuggerMessage, this);
       this._debuggerModel.addEventListener(
           SDK.DebuggerModel.Events.DebuggerResumed, this._updatePausedInDebuggerMessage, this);
@@ skipping 283 matching lines @@
   /**
    * @override
    * @param {!Protocol.Page.FrameId} frameId
    */
   highlightFrame(frameId) {
     this._model._overlayAgent.highlightFrame(
         frameId, Common.Color.PageHighlight.Content.toProtocolRGBA(),
         Common.Color.PageHighlight.ContentOutline.toProtocolRGBA());
   }
 };