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

mojo/examples/echo/echo_client.cc

Index: mojo/examples/echo/echo_client.cc
diff --git a/mojo/examples/echo/echo_client.cc b/mojo/examples/echo/echo_client.cc
index 0e6d7b94031268609de845da74d928a150f76a2b..61a79abdb5b86cde81a9a06e7ec06292131286e1 100644
--- a/mojo/examples/echo/echo_client.cc
+++ b/mojo/examples/echo/echo_client.cc
@@ -6,7 +6,9 @@
 
 #include "mojo/examples/echo/echo_service.mojom.h"
 #include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_export.h"
 #include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/application_runner.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 
 namespace mojo {
@@ -34,10 +36,10 @@ class EchoClientDelegate : public ApplicationDelegate {
 };
 
 }  // namespace examples
+}  // namespace mojo
 
-// static
-ApplicationDelegate* ApplicationDelegate::Create() {
-  return new examples::EchoClientDelegate();
+extern "C" APPLICATION_EXPORT MojoResult CDECL MojoMain(
+    MojoHandle shell_handle) {
+  return mojo::ApplicationRunner(
+      new mojo::examples::EchoClientDelegate).Run(shell_handle);
 }
-
-}  // namespace mojo