Fix ownership bug with ViewObserver::OnViewInputEvent

mojo/examples/nesting_app/nesting_app.cc

Index: mojo/examples/nesting_app/nesting_app.cc
diff --git a/mojo/examples/nesting_app/nesting_app.cc b/mojo/examples/nesting_app/nesting_app.cc
index 3c06c8db8fc2e423f04e7e8b5fd4bbbc7c8dc0e9..249cc374873b8d9186126eff129ec7c6338e5f51 100644
--- a/mojo/examples/nesting_app/nesting_app.cc
+++ b/mojo/examples/nesting_app/nesting_app.cc
@@ -58,7 +58,7 @@ class NestingApp : public Application,
   }
 
   // Overridden from ViewObserver:
-  virtual void OnViewInputEvent(View* view, EventPtr event) OVERRIDE {
+  virtual void OnViewInputEvent(View* view, const EventPtr& event) OVERRIDE {
     if (event->action == ui::ET_MOUSE_RELEASED)
       window_manager_->CloseWindow(view->node()->id());
   }
@@ -75,4 +75,4 @@ Application* Application::Create() {
   return new examples::NestingApp;
 }
 
-}  // namespace mojo
+}  // namespace mojo