Neuter the wrong-way ServiceProvider (a.k.a. exposed_services).

mojo/public/interfaces/application/application_connector.mojom

Index: mojo/public/interfaces/application/application_connector.mojom
diff --git a/mojo/public/interfaces/application/application_connector.mojom b/mojo/public/interfaces/application/application_connector.mojom
index 23df7f615e3cccd732d243580b31699c6d01a6b9..7cbb6794f2dfff2f2902b4337d5220f081d383f5 100644
--- a/mojo/public/interfaces/application/application_connector.mojom
+++ b/mojo/public/interfaces/application/application_connector.mojom
@@ -31,6 +31,10 @@ interface ApplicationConnector {
   // "mojo:{service}", it is up to the Mojo shell to select an appropriate
   // application for the service. Currently, the shell does this based on the
   // value of its --origin flag.
+  //
+  // WARNING: |exposed_services| is deprecated and non-functional, and will be
+  // removed. Note that this also means that |services| will become required.
+  // https://github.com/domokit/mojo/issues/762
   ConnectToApplication(string application_url,
                        ServiceProvider&? services,
                        ServiceProvider? exposed_services);