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

mojo/examples/sample_app/sample_app.cc

Index: mojo/examples/sample_app/sample_app.cc
diff --git a/mojo/examples/sample_app/sample_app.cc b/mojo/examples/sample_app/sample_app.cc
index ceebd61b88b5fa4541066af6cfd167bc03c53e89..c8190bb2cd23cab6439459388f2c4b6dc28c5e38 100644
--- a/mojo/examples/sample_app/sample_app.cc
+++ b/mojo/examples/sample_app/sample_app.cc
@@ -9,8 +9,10 @@
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/application_runner.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/system/macros.h"
+#include "mojo/public/cpp/system/main.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 
@@ -77,11 +79,7 @@ class SampleApp : public mojo::ApplicationDelegate,
 
 }  // namespace examples
 
-namespace mojo {
-
-// static
-ApplicationDelegate* ApplicationDelegate::Create() {
-  return new examples::SampleApp();
+MojoResult MojoMain(MojoHandle shell_handle) {
+  mojo::ApplicationRunner runner(new examples::SampleApp);
+  return runner.Run(shell_handle);
 }
-
-}  // namespace mojo