Make RunApplication() return a MojoResult and TerminateApplication() take one.

examples/spinning_cube/spinning_cube_app.cc

Index: examples/spinning_cube/spinning_cube_app.cc
diff --git a/examples/spinning_cube/spinning_cube_app.cc b/examples/spinning_cube/spinning_cube_app.cc
index adcef63976df44f0fa2f3fbb6ed2aabab4aa8207..eac07b2785c7c33819998afb0696929d5094d2e2 100644
--- a/examples/spinning_cube/spinning_cube_app.cc
+++ b/examples/spinning_cube/spinning_cube_app.cc
@@ -95,6 +95,5 @@ class SpinningCubeApp : public mojo::ApplicationImplBase,
 
 MojoResult MojoMain(MojoHandle application_request) {
   examples::SpinningCubeApp spinning_cube_app;
-  mojo::RunApplication(application_request, &spinning_cube_app);
-  return MOJO_RESULT_OK;
+  return mojo::RunApplication(application_request, &spinning_cube_app);
 }