Make Tracing Service not use outgoing InterfaceProvider, update conventions

mash/login/login.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/login/login.h"
 
 #include <map>
 #include <memory>
 
 #include "ash/public/interfaces/container.mojom.h"
 #include "base/guid.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mash/init/public/interfaces/init.mojom.h"
 #include "mash/login/public/interfaces/login.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/cpp/connector.h"
 #include "services/shell/public/cpp/service.h"
-#include "services/tracing/public/cpp/tracing_impl.h"
+#include "services/tracing/public/cpp/provider.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "services/ui/public/interfaces/user_access_manager.mojom.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/label_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"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace mash {
@@ skipping 142 matching lines @@
   void ShowLoginUI() override {
     UI::Show(connector(), identity_, this);
   }
   void SwitchUser() override {
     UI::Show(connector(), identity_, this);
   }
 
   void StartWindowManager();
 
   shell::Identity identity_;
-  mojo::TracingImpl tracing_;
+  tracing::Provider tracing_;
   std::unique_ptr<views::AuraInit> aura_init_;
   mojo::BindingSet<mojom::Login> bindings_;
   ui::mojom::UserAccessManagerPtr user_access_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(Login);
 };
 
 void UI::ButtonPressed(views::Button* sender, const ui::Event& event) {
   // Login...
   if (sender == login_button_1_) {
     login_->LoginAs(user_id_1_);
   } else if (sender == login_button_2_) {
     login_->LoginAs(user_id_2_);
   } else {
     NOTREACHED();
   }
   GetWidget()->Close();
 }
 
 }  // namespace
 
 shell::Service* CreateLogin() {
   return new Login;
 }
 
 }  // namespace login
 }  // namespace main