Mojo C++ bindings: remove some usage of AssociatedGroup from user code.

services/service_manager/public/cpp/lib/service_context.cc

Index: services/service_manager/public/cpp/lib/service_context.cc
diff --git a/services/service_manager/public/cpp/lib/service_context.cc b/services/service_manager/public/cpp/lib/service_context.cc
index 1726027b726df7bb29f7c5cd7356c456f16a76ad..f45202e56b2324dd81f75d51d817a88c810a7fff 100644
--- a/services/service_manager/public/cpp/lib/service_context.cc
+++ b/services/service_manager/public/cpp/lib/service_context.cc
@@ -81,9 +81,8 @@ void ServiceContext::DestroyService() {
 void ServiceContext::OnStart(const ServiceInfo& info,
                              const OnStartCallback& callback) {
   local_info_ = info;
-  callback.Run(
-      std::move(pending_connector_request_),
-      mojo::MakeRequest(&service_control_, binding_.associated_group()));
+  callback.Run(std::move(pending_connector_request_),
+               mojo::MakeRequest(&service_control_));
 
   service_->set_context(this);
   service_->OnStart();