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

mojo/examples/compositor_app/compositor_app.cc

Index: mojo/examples/compositor_app/compositor_app.cc
diff --git a/mojo/examples/compositor_app/compositor_app.cc b/mojo/examples/compositor_app/compositor_app.cc
index c169d14c1258c66549edb2fcf70ca63bef24c2f2..16a9184cf2fed20cc6559459717a1a299f847752 100644
--- a/mojo/examples/compositor_app/compositor_app.cc
+++ b/mojo/examples/compositor_app/compositor_app.cc
@@ -7,8 +7,10 @@
 
 #include "base/macros.h"
 #include "mojo/examples/compositor_app/compositor_host.h"
+#include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/application_runner_chromium.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/services/public/cpp/geometry/geometry_type_converters.h"
 #include "mojo/services/public/interfaces/gpu/gpu.mojom.h"
@@ -60,10 +62,9 @@ class SampleApp : public ApplicationDelegate, public NativeViewportClient {
 };
 
 }  // namespace examples
+}  // namespace mojo
 
-// static
-ApplicationDelegate* ApplicationDelegate::Create() {
-  return new examples::SampleApp();
+MojoResult MojoMain(MojoHandle shell_handle) {
+  mojo::ApplicationRunnerChromium runner(new mojo::examples::SampleApp);
+  return runner.Run(shell_handle);
 }
-
-}  // namespace mojo