Replace OnConnect with OnBindInterface in //mash.

mash/session/session.cc

Index: mash/session/session.cc
diff --git a/mash/session/session.cc b/mash/session/session.cc
index 9306c365cc703eea3bfff16230c29cf98da05116..cd22965485f55129766d34c2b9c7a44d632b5758 100644
--- a/mash/session/session.cc
+++ b/mash/session/session.cc
@@ -39,11 +39,6 @@ void Session::OnStart() {
   context()->connector()->Connect(content::mojom::kBrowserServiceName);
 }
 
-bool Session::OnConnect(const service_manager::ServiceInfo& remote_info,
-                        service_manager::InterfaceRegistry* registry) {
-  return true;
-}
-
 void Session::StartWindowManager() {
   StartRestartableService(
       common::GetWindowManagerServiceName(),