Mojo C++ bindings: Generate InterfaceHandle<> instead of InterfacePtr<>.

mojo/public/cpp/application/connect.h

Index: mojo/public/cpp/application/connect.h
diff --git a/mojo/public/cpp/application/connect.h b/mojo/public/cpp/application/connect.h
index 06b79e7e4e0cf0e085024bc759774d1b848d73ad..4b6e97e9255ed689f91d95cb36501658f9c78e81 100644
--- a/mojo/public/cpp/application/connect.h
+++ b/mojo/public/cpp/application/connect.h
@@ -26,8 +26,8 @@ inline void ConnectToService(Shell* shell,
                              const std::string& application_url,
                              InterfacePtr<Interface>* ptr) {
   ServiceProviderPtr service_provider;
-  shell->ConnectToApplication(application_url,
-                              GetProxy(&service_provider), nullptr);
+  shell->ConnectToApplication(application_url, GetProxy(&service_provider),
+                              InterfaceHandle<ServiceProvider>());
   ConnectToService(service_provider.get(), ptr);
 }
 
@@ -38,7 +38,8 @@ inline void ConnectToService(ApplicationConnector* application_connector,
                              InterfacePtr<Interface>* ptr) {
   ServiceProviderPtr service_provider;
   application_connector->ConnectToApplication(
-      application_url, GetProxy(&service_provider), nullptr);
+      application_url, GetProxy(&service_provider),
+      InterfaceHandle<ServiceProvider>());
   ConnectToService(service_provider.get(), ptr);
 }