[DevTools] Do not expose agents on Target

third_party/WebKit/Source/devtools/front_end/resources/DatabaseModel.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 113 matching lines @@
     this._model._agent.executeSQL(this._id, query, callback);
   }
 };
 
 /**
  * @unrestricted
  */
 Resources.DatabaseModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
+   * @param {!Protocol.Dispatcher} dispatcher
    */
-  constructor(target) {
-    super(target);
+  constructor(target, dispatcher) {
+    super(target, dispatcher);
 
     this._databases = [];
-    this._agent = target.databaseAgent();
-    this.target().registerDatabaseDispatcher(new Resources.DatabaseDispatcher(this));
+    this._agent = dispatcher.databaseAgent();
+    dispatcher.registerDatabaseDispatcher(new Resources.DatabaseDispatcher(this));
   }
 
   enable() {
     if (this._enabled)
       return;
     this._agent.enable();
     this._enabled = true;
   }
 
   disable() {
@@ skipping 48 matching lines @@
    * @override
    * @param {!Protocol.Database.Database} payload
    */
   addDatabase(payload) {
     this._model._addDatabase(
         new Resources.Database(this._model, payload.id, payload.domain, payload.name, payload.version));
   }
 };
 
 Resources.DatabaseModel._symbol = Symbol('DatabaseModel');