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

mojo/public/cpp/application/lib/application_runner.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_runner.h"
+
+#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"
+
+namespace mojo {
+
+// static
+void ApplicationImpl::Terminate() {
+  RunLoop::current()->Quit();
+}
+
+ApplicationRunner::ApplicationRunner() : delegate_(NULL) {}
+ApplicationRunner::~ApplicationRunner() { assert(!delegate_); }
+
+void ApplicationRunner::take_delegate(ApplicationDelegate* delegate) {
+  assert(!delegate_);
+  assert(delegate);
+  delegate_ = delegate;
+}
+
+MojoResult ApplicationRunner::Run(MojoHandle shell_handle) {
+  Environment env;
+  env.GetDefaultAsyncWaiter();
+  {
+    RunLoop loop;
+    ApplicationImpl app(delegate_,
+        MakeScopedHandle(MessagePipeHandle(shell_handle)));
+    loop.Run();
+  }
+
+  delete delegate_;
+  delegate_ = NULL;
+  return MOJO_RESULT_OK;
+}
+
+}  // namespace mojo