[DevTools] Do not expose agents on Target

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
index 41688edbbefad50b5304eae34b1f06c755c811dc..98aafc0fc1ebd6c1af90b1152c7e96f5c7f9ad80 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/CSSModel.js
@@ -34,20 +34,21 @@
 SDK.CSSModel = 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));
     /** @type {!SDK.SourceMapManager<!SDK.CSSStyleSheetHeader>} */
     this._sourceMapManager = new SDK.SourceMapManager(target);
-    this._agent = target.cssAgent();
+    this._agent = dispatcher.cssAgent();
     this._styleLoader = new SDK.CSSModel.ComputedStyleLoader(this);
     this._resourceTreeModel = target.model(SDK.ResourceTreeModel);
     if (this._resourceTreeModel) {
       this._resourceTreeModel.addEventListener(
           SDK.ResourceTreeModel.Events.MainFrameNavigated, this._resetStyleSheets, this);
     }
-    target.registerCSSDispatcher(new SDK.CSSDispatcher(this));
+    dispatcher.registerCSSDispatcher(new SDK.CSSDispatcher(this));
     this._agent.enable().then(this._wasEnabled.bind(this));
     /** @type {!Map.<string, !SDK.CSSStyleSheetHeader>} */
     this._styleSheetIdToHeader = new Map();