Reland: chromeos: Convert ash VPNDelegate interface to mojo

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 ddb870f4be3b87af1f9f9edd3c0824a666f88782..a29dc9e41e570d387e5185d7056f4b438320988e 100644
--- a/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/system_tray_delegate_chromeos.h
@@ -42,7 +42,6 @@
 
 namespace ash {
 class SystemTrayNotifier;
-class VPNDelegate;
 }
 
 namespace user_manager {
@@ -115,7 +114,6 @@ class SystemTrayDelegateChromeOS
       ash::CustodianInfoTrayObserver* observer) override;
   void RemoveCustodianInfoTrayObserver(
       ash::CustodianInfoTrayObserver* observer) override;
-  ash::VPNDelegate* GetVPNDelegate() const override;
   std::unique_ptr<ash::SystemTrayItem> CreateRotationLockTrayItem(
       ash::SystemTray* tray) override;
 
@@ -244,7 +242,6 @@ class SystemTrayDelegateChromeOS
   std::unique_ptr<ash::CastConfigDelegate> cast_config_delegate_;
   std::unique_ptr<ash::NetworkingConfigDelegate> networking_config_delegate_;
   std::unique_ptr<AccessibilityStatusSubscription> accessibility_subscription_;
-  std::unique_ptr<ash::VPNDelegate> vpn_delegate_;
 
   base::ObserverList<ash::CustodianInfoTrayObserver>
       custodian_info_changed_observers_;