Add implementations of mojo::{Run,Terminate}[Main]Application() for "chromium".

services/tracing/main.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/application/application_runner_chromium.h"
 #include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/run_application.h"
 #include "services/tracing/tracing_app.h"
 
 MojoResult MojoMain(MojoHandle application_request) {
-  mojo::ApplicationRunnerChromium runner(new tracing::TracingApp);
-  return runner.Run(application_request);
+  tracing::TracingApp tracing_app;
+  return mojo::RunMainApplication(application_request, &tracing_app);
 }