chromeos: Migrate SignOut and RequestRestartForUpdate to mojo interface

ash/common/system/tray/system_tray_controller.h

 // 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.
 
 #ifndef ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_CONTROLLER_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/public/interfaces/system_tray.mojom.h"
 #include "base/compiler_specific.h"
@@ skipping 39 matching lines @@
   void ShowHelp();
   void ShowAccessibilityHelp();
   void ShowAccessibilitySettings();
   void ShowPaletteHelp();
   void ShowPaletteSettings();
   void ShowPublicAccountInfo();
   void ShowNetworkConfigure(const std::string& network_id);
   void ShowNetworkCreate(const std::string& type);
   void ShowNetworkSettings(const std::string& network_id);
   void ShowProxySettings();
+  void SignOut();
+  void RequestRestartForUpdate();
 
   // Binds the mojom::SystemTray interface to this object.
   void BindRequest(mojom::SystemTrayRequest request);
 
  private:
   // Connects or reconnects to the mojom::SystemTrayClient interface when
   // running on Chrome OS. Otherwise does nothing. Returns true if connected.
   bool ConnectToSystemTrayClient();
 
   // Handles errors on the |system_tray_client_| interface connection.
@@ skipping 13 matching lines @@
 
   // The type of clock hour display: 12 or 24 hour.
   base::HourClockType hour_clock_type_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayController);
 };
 
 }  // namspace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_CONTROLLER_H_