Reify view ownership as a message pipe.

apps/moterm/moterm_app.h

Index: apps/moterm/moterm_app.h
diff --git a/apps/moterm/moterm_app.h b/apps/moterm/moterm_app.h
index 0b4aeada15ddf4ef12a34e6f1ebed9c280132185..7ff9f68797f7a648545b9ece2b663858089e9721 100644
--- a/apps/moterm/moterm_app.h
+++ b/apps/moterm/moterm_app.h
@@ -13,11 +13,11 @@ class MotermApp : public mojo::ui::ViewProviderApp {
   MotermApp();
   ~MotermApp() override;
 
-  bool CreateView(
+  void CreateView(
       const std::string& connection_url,
+      mojo::InterfaceRequest<mojo::ui::ViewOwner> view_owner_request,
       mojo::InterfaceRequest<mojo::ServiceProvider> services,
-      mojo::ServiceProviderPtr exposed_services,
-      const mojo::ui::ViewProvider::CreateViewCallback& callback) override;
+      mojo::ServiceProviderPtr exposed_services) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MotermApp);