mojo: first take on removing mojo_main_{chromium,standalone}.

mojo/public/cpp/application/lib/mojo_main_standalone.cc

-// Copyright 2014 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/cpp/application/application_delegate.h"
-#include "mojo/public/cpp/application/application_impl.h"
-#include "mojo/public/cpp/environment/environment.h"
-#include "mojo/public/cpp/utility/run_loop.h"
-
-extern "C" APPLICATION_EXPORT MojoResult CDECL MojoMain(
-    MojoHandle shell_handle) {
-  mojo::Environment env;
-  mojo::ApplicationDelegate* delegate = NULL;
-  {
-    // We have to shut down the RunLoop before destroying the
-    // ApplicationDelegate.
-    mojo::RunLoop loop;
-    delegate = mojo::ApplicationDelegate::Create();
-    {
-      mojo::ApplicationImpl app(delegate);
-      app.BindShell(shell_handle);
-      loop.Run();
-    }
-  }
-  delete delegate;
-
-  return MOJO_RESULT_OK;
-}