[DevTools] Do not expose agents on Target

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
index 845799186c8c7e545291780d06e2af197e996872..50920285c1026723d3ed1c0aa4d4644d71db6df8 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
@@ -1054,11 +1054,12 @@ SDK.DOMDocument = class extends SDK.DOMNode {
 SDK.DOMModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
+   * @param {!Protocol.Dispatcher} dispatcher
    */
-  constructor(target) {
-    super(target);
+  constructor(target, dispatcher) {
+    super(target, dispatcher);
 
-    this._agent = target.domAgent();
+    this._agent = dispatcher.domAgent();
 
     /** @type {!Object.<number, !SDK.DOMNode>} */
     this._idToDOMNode = {};
@@ -1066,7 +1067,7 @@ SDK.DOMModel = class extends SDK.SDKModel {
     this._document = null;
     /** @type {!Object.<number, boolean>} */
     this._attributeLoadNodeIds = {};
-    target.registerDOMDispatcher(new SDK.DOMDispatcher(this));
+    dispatcher.registerDOMDispatcher(new SDK.DOMDispatcher(this));
 
     this._runtimeModel = /** @type {!SDK.RuntimeModel} */ (target.model(SDK.RuntimeModel));