chromeos: Migrate SignOut and RequestRestartForUpdate to mojo interface

ash/common/system/update/tray_update.cc

 // Copyright (c) 2012 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 "ash/common/system/update/tray_update.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/metrics/user_metrics_action.h"
 #include "ash/common/system/tray/fixed_sized_image_view.h"
 #include "ash/common/system/tray/system_tray.h"
+#include "ash/common/system/tray/system_tray_controller.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_popup_item_style.h"
 #include "ash/common/system/tray/tray_popup_utils.h"
 #include "ash/common/wm_shell.h"
 #include "ash/resources/vector_icons/vector_icons.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 91 matching lines @@
 
     if (MaterialDesignController::IsSystemTrayMenuMaterial())
       SetInkDropMode(InkDropHostView::InkDropMode::ON);
   }
 
   ~UpdateView() override {}
 
  private:
   // Overridden from ActionableView.
   bool PerformAction(const ui::Event& event) override {
-    WmShell::Get()->system_tray_delegate()->RequestRestartForUpdate();
+    WmShell::Get()->system_tray_controller()->RequestRestartForUpdate();
     WmShell::Get()->RecordUserMetricsAction(
         UMA_STATUS_AREA_OS_UPDATE_DEFAULT_SELECTED);
     CloseSystemBubble();
     return true;
   }
 
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override {
     ActionableView::OnNativeThemeChanged(theme);
 
     if (!MaterialDesignController::IsSystemTrayMenuMaterial())
@@ skipping 34 matching lines @@
 
 void TrayUpdate::OnUpdateRecommended(const UpdateInfo& info) {
   if (MaterialDesignController::UseMaterialDesignSystemIcons())
     SetIconColor(IconColorForUpdateSeverity(info.severity, false));
   else
     SetImageFromResourceId(DecideResource(info.severity, false));
   tray_view()->SetVisible(true);
 }
 
 }  // namespace ash