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

ash/common/system/chromeos/network/vpn_list_view.cc

 // 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.
 
 #include "ash/common/system/chromeos/network/vpn_list_view.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 454 matching lines @@
   // by shill.
   for (const chromeos::NetworkState* const& network : networks) {
     if (key.MatchesNetwork(*network))
       AddNetwork(network);
   }
 }
 
 void VPNListView::AddProvidersAndNetworks(
     const chromeos::NetworkStateHandler::NetworkStateList& networks) {
   // Get the list of VPN providers enabled in the primary user's profile.
-  std::vector<VPNProvider> providers = WmShell::Get()
-                                           ->system_tray_delegate()
-                                           ->GetVPNDelegate()
-                                           ->GetVPNProviders();
+  std::vector<VPNProvider> providers =
+      WmShell::Get()->system_tray_delegate()->GetVPNDelegate()->vpn_providers();
 
   // Add providers with at least one configured network along with their
   // networks. Providers are added in the order of their highest priority
   // network.
   for (const chromeos::NetworkState* const& network : networks) {
     for (auto provider = providers.begin(); provider != providers.end();
          ++provider) {
       if (!provider->key.MatchesNetwork(*network))
         continue;
       AddProviderAndNetworks(provider->key, provider->name, networks);
       providers.erase(provider);
       break;
     }
   }
 
   // Add providers without any configured networks, in the order that the
   // providers were returned by the extensions system.
   for (const VPNProvider& provider : providers)
     AddProviderAndNetworks(provider.key, provider.name, networks);
 }
 
 }  // namespace ash