Add RunMainApplication()/TerminateMainApplication() for use in MojoMain().

mojo/public/cpp/bindings/tests/versioning_test_service.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 <map>
 #include <memory>
 
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_impl_base.h"
 #include "mojo/public/cpp/application/run_application.h"
@@ skipping 103 matching lines @@
  private:
   MOJO_DISALLOW_COPY_AND_ASSIGN(HumanResourceSystemServer);
 };
 
 }  // namespace versioning
 }  // namespace test
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::test::versioning::HumanResourceSystemServer hr_system_server;
-  return mojo::RunApplication(application_request, &hr_system_server);
+  return mojo::RunMainApplication(application_request, &hr_system_server);
 }