mash: Create system tray display and rotation lock items via delegate

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

Index: chrome/browser/ui/ash/system_tray_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
index 64ba22a3e52a2ed4b8ceeb655674c4e94a2a9149..a2036ce28735fd33f8df367758e40ff176f70845 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
@@ -152,6 +152,10 @@ class SystemTrayDelegateChromeOS
   void ShouldRebootOnShutdown(
       const ash::RebootOnShutdownCallback& callback) override;
   ash::VPNDelegate* GetVPNDelegate() const override;
+  std::unique_ptr<ash::SystemTrayItem> CreateDisplayTrayItem(
+      ash::SystemTray* tray) override;
+  std::unique_ptr<ash::SystemTrayItem> CreateRotationLockTrayItem(
+      ash::SystemTray* tray) override;
 
   // Overridden from user_manager::UserManager::UserSessionStateObserver:
   void UserAddedToSession(const user_manager::User* active_user) override;