Convert //mash to define service names in mojom

mash/init/init.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mash/init/init.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/guid.h"
+#include "mash/login/public/interfaces/constants.mojom.h"
 #include "mash/login/public/interfaces/login.mojom.h"
 #include "services/service_manager/public/cpp/connection.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 #include "services/service_manager/public/cpp/service_context.h"
 #include "services/tracing/public/interfaces/constants.mojom.h"
 #include "services/ui/public/interfaces/constants.mojom.h"
 
 namespace mash {
 namespace init {
@@ skipping 40 matching lines @@
   auto it = user_services_.find(user_id);
   DCHECK(it != user_services_.end());
   user_services_.erase(it);
 }
 
 void Init::StartTracing() {
   context()->connector()->Connect(tracing::mojom::kServiceName);
 }
 
 void Init::StartLogin() {
-  login_connection_ = context()->connector()->Connect("login");
+  login_connection_ =
+      context()->connector()->Connect(login::mojom::kServiceName);
   mash::login::mojom::LoginPtr login;
   login_connection_->GetInterface(&login);
   login->ShowLoginUI();
 }
 
 }  // namespace init
 }  // namespace main