chromeos: Move ownership of ash VPN provider list from chrome into ash

chrome/browser/ui/ash/vpn_delegate_chromeos.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_DELEGATE_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_VPN_DELEGATE_CHROMEOS_H_
 
 #include <vector>
 
 #include "ash/common/system/chromeos/network/vpn_delegate.h"
@@ skipping 10 matching lines @@
 // Chrome OS implementation of a delegate that provides UI code in ash with
 // access to the VPN providers enabled in the primary user's profile.
 class VPNDelegateChromeOS : public ash::VPNDelegate,
                             public extensions::ExtensionRegistryObserver,
                             public content::NotificationObserver {
  public:
   VPNDelegateChromeOS();
   ~VPNDelegateChromeOS() override;
 
   // ash::VPNDelegate:
-  bool HaveThirdPartyVPNProviders() const override;
-  const std::vector<ash::VPNProvider>& GetVPNProviders() const override;
-  void ShowAddPage(const ash::VPNProvider::Key& key) override;
+  void ShowAddPage(const std::string& extension_id) 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;
 
@@ skipping 10 matching lines @@
   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();
 
   // The primary user's extension registry, if a user is logged in.
   extensions::ExtensionRegistry* extension_registry_ = nullptr;
 
-  // A cache of the VPN providers enabled in the primary user's profile.
-  std::vector<ash::VPNProvider> vpn_providers_;
-
   content::NotificationRegistrar registrar_;
 
   base::WeakPtrFactory<VPNDelegateChromeOS> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VPNDelegateChromeOS);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_VPN_DELEGATE_CHROMEOS_H_