Reland: chromeos: Convert ash VPNDelegate interface to mojo

ash/mus/vpn_delegate_mus.h

Index: ash/mus/vpn_delegate_mus.h
diff --git a/ash/mus/vpn_delegate_mus.h b/ash/mus/vpn_delegate_mus.h
deleted file mode 100644
index 5c44a72f7f0cd4299d5c8e1c4c3183ddd29ce4ca..0000000000000000000000000000000000000000
--- a/ash/mus/vpn_delegate_mus.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// 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_MUS_VPN_DELEGATE_MUS_H_
-#define ASH_MUS_VPN_DELEGATE_MUS_H_
-
-#include "ash/common/system/chromeos/network/vpn_delegate.h"
-#include "base/macros.h"
-
-namespace ash {
-
-// VPN delegate for mustash. Fetches VPN data from browser process over mojo.
-class VPNDelegateMus : public VPNDelegate {
- public:
-  VPNDelegateMus();
-  ~VPNDelegateMus() override;
-
- private:
-  // VPNDelegate:
-  void ShowAddPage(const std::string& extension_id) override;
-
-  DISALLOW_COPY_AND_ASSIGN(VPNDelegateMus);
-};
-
-}  // namespace ash
-
-#endif  // ASH_MUS_VPN_DELEGATE_MUS_H_