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

mojo/examples/png_viewer/png_viewer.cc

Index: mojo/examples/png_viewer/png_viewer.cc
diff --git a/mojo/examples/png_viewer/png_viewer.cc b/mojo/examples/png_viewer/png_viewer.cc
index 2a6c9b8ca24361bc625839d3496a3405b770fc54..371a564ba9985060bd98848b7ff873a1fc6916e4 100644
--- a/mojo/examples/png_viewer/png_viewer.cc
+++ b/mojo/examples/png_viewer/png_viewer.cc
@@ -9,6 +9,8 @@
 #include "mojo/examples/media_viewer/media_viewer.mojom.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_export.h"
+#include "mojo/public/cpp/application/application_runner_chromium.h"
 #include "mojo/public/cpp/application/interface_factory_impl.h"
 #include "mojo/services/public/cpp/view_manager/types.h"
 #include "mojo/services/public/cpp/view_manager/view.h"
@@ -244,10 +246,10 @@ void NavigatorImpl::UpdateView(Id view_id,
 }
 
 }  // namespace examples
+}  // namespace mojo
 
-// static
-ApplicationDelegate* ApplicationDelegate::Create() {
-  return new examples::PNGViewer;
+extern "C" APPLICATION_EXPORT MojoResult CDECL MojoMain(
+    MojoHandle shell_handle) {
+  mojo::ApplicationRunnerChromium runner(new mojo::examples::PNGViewer);
+  return runner.Run(shell_handle);
 }
-
-}  // namespace mojo