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 f3ff759604020a44eeaa17777dea6f1236846c7a..655932a293a0f1efd0ecbe7c7f1110ad38938f98 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/node.h"
 #include "mojo/services/public/cpp/view_manager/node_observer.h"
@@ -246,10 +248,10 @@ void NavigatorImpl::UpdateView(Id node_id,
 }
 
 }  // namespace examples
+}  // namespace mojo
 
-// static
-ApplicationDelegate* ApplicationDelegate::Create() {
-  return new examples::PNGViewer;
+extern "C" APPLICATION_EXPORT MojoResult CDECL MojoMain(
+    MojoHandle shell_handle) {
+  return mojo::ApplicationRunnerChromium(
+      make_scoped_delegate(new mojo::examples::PNGViewer)).Run(shell_handle);
 }
-
-}  // namespace mojo