[DevTools] Do not expose agents on Target

third_party/WebKit/LayoutTests/http/tests/inspector/page-mock.js

 var initialize_EmptyPageMock = function() {
 
 var id = 0;
 
 function nextId(prefix) {
     return (prefix || '') + (++id);
 }
 
 InspectorTest.connectToPage = function(targetName, pageMock, makeMainTarget) {
-    var mockTarget = SDK.targetManager.createTarget(nextId('mock-target-'), targetName, pageMock.capabilities(), params => pageMock.createConnection(params));
+    var dispatcher = new Protocol.Dispatcher(params => pageMock.createConnection(params));
+    var mockTarget = SDK.targetManager.createTarget(nextId('mock-target-'), targetName, pageMock.capabilities(), dispatcher);
     if (makeMainTarget) {
         SDK.targetManager._targets = SDK.targetManager._targets.filter(target => target !== mockTarget);
         SDK.targetManager._targets.unshift(mockTarget);
     }
     return mockTarget;
 }
 
 InspectorTest.PageMock = class {
     constructor(url) {
         this._url = url;
@@ skipping 219 matching lines @@
     disconnect() {
         this._onDisconnect.call(null, 'force disconnect');
         this._onDisconnect = null;
         this._onMessage = null;
         return Promise.resolve();
     }
 };
 
 };