Get rid of {Run,Terminate}MainApplication(), and more ApplicationDelegate conversion.

examples/authentication_demo/google_authentication_demo.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_impl_base.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/public/cpp/application/run_application.h"
@@ skipping 110 matching lines @@
   }
 
   ::authentication::AuthenticationServicePtr authentication_service_;
 };
 
 }  // namespace authentication
 }  // namespace examples
 
 MojoResult MojoMain(MojoHandle application_request) {
   examples::authentication::GoogleAuthApp google_auth_app;
-  return mojo::RunMainApplication(application_request, &google_auth_app);
+  return mojo::RunApplication(application_request, &google_auth_app);
 }