Shutdown cleanup

mojo/examples/sample_app/sample_app.cc

Index: mojo/examples/sample_app/sample_app.cc
diff --git a/mojo/examples/sample_app/sample_app.cc b/mojo/examples/sample_app/sample_app.cc
index c5a57abe9644cb2d4c119151f690861a5f1b7609..cfc9ef7b45ee3aec3dc743694fcd77671ec03229 100644
--- a/mojo/examples/sample_app/sample_app.cc
+++ b/mojo/examples/sample_app/sample_app.cc
@@ -48,8 +48,10 @@ class SampleApp : public ApplicationDelegate, public NativeViewportClient {
   virtual void OnCreated() MOJO_OVERRIDE {
   }
 
-  virtual void OnDestroyed() MOJO_OVERRIDE {
+  virtual void OnDestroyed(
+      const mojo::Callback<void()>& callback) MOJO_OVERRIDE {
     RunLoop::current()->Quit();
+    callback.Run();
   }
 
   virtual void OnBoundsChanged(RectPtr bounds) MOJO_OVERRIDE {