Mojo JS Bindings: Eliminate foo$ Stub and Proxy class members

services/js/test/network_test.js

 #!mojo:js_content_handler
 
 define("main", [
   "mojo/services/public/js/application",
   "mojo/public/js/core",
   "mojo/services/network/public/interfaces/network_service.mojom",
   "mojo/services/network/public/interfaces/url_loader.mojom",
   "services/js/test/network_test_service.mojom",
 ], function(application,
             core,
             networkServiceMojom,
             urlLoaderMojom,
             networkTestServiceMojom) {
 
   const Application = application.Application;
   const NetworkService = networkServiceMojom.NetworkService;
   const URLRequest = urlLoaderMojom.URLRequest;
   const NetworkTestService = networkTestServiceMojom.NetworkTestService;
 
   class NetworkTestServiceImpl {
     constructor(app) {
       this.app = app;
       var netService = app.shell.connectToService(
           "mojo:network_service", NetworkService);
-      var urlLoaderClient = {};
-      netService.createURLLoader(urlLoaderClient);
-      this.urlLoader = urlLoaderClient.remote$;
+      var urlLoader;
+      netService.createURLLoader(function(x){urlLoader = x;});
+      this.urlLoader = urlLoader;
     }
 
     getFileSize(url) {
       var impl = this;
       return new Promise(function(resolve) {
         var urlRequest = new URLRequest({
           url: url,
           method: "GET",
           auto_follow_redirects: true
         });
@@ skipping 16 matching lines @@
   class NetworkTest extends Application {
     acceptConnection(url, serviceProvider) {
       serviceProvider.provideService(
           NetworkTestService,
           NetworkTestServiceImpl.bind(null, this));
     }
   }
 
   return NetworkTest;
 });