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

chrome/browser/ui/ash/vpn_delegate_chromeos.h

Index: chrome/browser/ui/ash/vpn_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/vpn_delegate_chromeos.h b/chrome/browser/ui/ash/vpn_delegate_chromeos.h
index c4c42b9de66e828dc6bc0cca940ddad1907187b7..bd18557a448b539886a7e8430420a9743831fdc0 100644
--- a/chrome/browser/ui/ash/vpn_delegate_chromeos.h
+++ b/chrome/browser/ui/ash/vpn_delegate_chromeos.h
@@ -28,9 +28,7 @@ class VPNDelegateChromeOS : public ash::VPNDelegate,
   ~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,
@@ -61,9 +59,6 @@ class VPNDelegateChromeOS : public ash::VPNDelegate,
   // 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_;