Revert of chromeos: Convert ash VPNDelegate interface to mojo

chrome/browser/ui/ash/vpn_list_forwarder.h

-// Copyright 2015 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 CHROME_BROWSER_UI_ASH_VPN_LIST_FORWARDER_H_
-#define CHROME_BROWSER_UI_ASH_VPN_LIST_FORWARDER_H_
-
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-#include "extensions/browser/extension_registry_observer.h"
-
-namespace extensions {
-class ExtensionRegistry;
-}
-
-// Forwards the list of extension-backed VPN providers in the primary user's
-// profile to ash over mojo.
-class VpnListForwarder : public extensions::ExtensionRegistryObserver,
-                         public content::NotificationObserver {
- public:
-  VpnListForwarder();
-  ~VpnListForwarder() override;
-
-  // extensions::ExtensionRegistryObserver:
-  void OnExtensionLoaded(content::BrowserContext* browser_context,
-                         const extensions::Extension* extension) override;
-  void OnExtensionUnloaded(
-      content::BrowserContext* browser_context,
-      const extensions::Extension* extension,
-      extensions::UnloadedExtensionInfo::Reason reason) override;
-  void OnShutdown(extensions::ExtensionRegistry* registry) override;
-
-  // content::NotificationObserver:
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
- private:
-  // Retrieves the current list of VPN providers enabled in the primary user's
-  // profile and notifies observers that it has changed. Must only be called
-  // when a user is logged in and the primary user's extension registry is being
-  // observed.
-  void UpdateVPNProviders();
-
-  // Starts observing the primary user's extension registry to detect changes to
-  // the list of VPN providers enabled in the user's profile and caches the
-  // initial list. Must only be called when a user is logged in.
-  void AttachToPrimaryUserExtensionRegistry();
-
-  // Whether this object has ever sent a third-party provider list to ash.
-  bool sent_providers_ = false;
-
-  // The primary user's extension registry, if a user is logged in.
-  extensions::ExtensionRegistry* extension_registry_ = nullptr;
-
-  content::NotificationRegistrar registrar_;
-
-  base::WeakPtrFactory<VpnListForwarder> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(VpnListForwarder);
-};
-
-#endif  // CHROME_BROWSER_UI_ASH_VPN_LIST_FORWARDER_H_