Convert //mash to define service names in mojom

mash/screenlock/screenlock.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/screenlock/screenlock.h"
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "mash/session/public/interfaces/constants.mojom.h"
 #include "mash/session/public/interfaces/session.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/service_context.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/md_text_button.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/native_widget_mus.h"
 #include "ui/views/mus/window_manager_connection.h"
@@ skipping 32 matching lines @@
 
     unlock_button_->SetBounds(bounds.width() - ps.width(),
                               bounds.bottom() + 10,
                               ps.width(), ps.height());
   }
 
   // Overridden from views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override {
     DCHECK_EQ(sender, unlock_button_);
     mash::session::mojom::SessionPtr session;
-    connector_->ConnectToInterface("mash_session", &session);
+    connector_->ConnectToInterface(session::mojom::kServiceName, &session);
     session->UnlockScreen();
   }
 
   service_manager::Connector* connector_;
   views::MdTextButton* unlock_button_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenlockView);
 };
 
 }  // namespace
 
 Screenlock::Screenlock() {}
 Screenlock::~Screenlock() {}
 
 void Screenlock::OnStart() {
   tracing_.Initialize(context()->connector(), context()->identity().name());
 
   mash::session::mojom::SessionPtr session;
-  context()->connector()->ConnectToInterface("mash_session", &session);
+  context()->connector()->ConnectToInterface(session::mojom::kServiceName,
+                                             &session);
   session->AddScreenlockStateListener(
       bindings_.CreateInterfacePtrAndBind(this));
 
   aura_init_ = base::MakeUnique<views::AuraInit>(
       context()->connector(), context()->identity(), "views_mus_resources.pak");
   window_manager_connection_ = views::WindowManagerConnection::Create(
       context()->connector(), context()->identity());
 
   views::Widget* widget = new views::Widget;
   views::Widget::InitParams params(
@@ skipping 18 matching lines @@
   return false;
 }
 
 void Screenlock::ScreenlockStateChanged(bool screen_locked) {
   if (!screen_locked)
     base::MessageLoop::current()->QuitWhenIdle();
 }
 
 }  // namespace screenlock
 }  // namespace mash