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

shell/test/pingable_app.cc

 // Copyright 2015 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 "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_impl_base.h"
 #include "mojo/public/cpp/application/run_application.h"
 #include "mojo/public/cpp/application/service_provider_impl.h"
 #include "mojo/public/cpp/bindings/callback.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
@@ skipping 39 matching lines @@
                mojo::InterfaceRequest<Pingable> pingable_request) {
           new PingableImpl(pingable_request.Pass(), url(),
                            connection_context.connection_url);
         });
     return true;
   }
 };
 
 MojoResult MojoMain(MojoHandle application_request) {
   PingableApp pingable_app;
-  return mojo::RunMainApplication(application_request, &pingable_app);
+  return mojo::RunApplication(application_request, &pingable_app);
 }