make ProxyService::CreateSystemProxyConfigService return scoped_ptrs

ios/chrome/browser/net/proxy_service_factory.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 IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_
 #define IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 25 matching lines @@
   // Creates a PrefProxyConfigTracker that tracks local state only. This tracker
   // should be used for the system request context.
   static scoped_ptr<PrefProxyConfigTracker>
   CreatePrefProxyConfigTrackerOfLocalState(PrefService* local_state_prefs);
 
   // Create a proxy service.
   static scoped_ptr<net::ProxyService> CreateProxyService(
       net::NetLog* net_log,
       net::URLRequestContext* context,
       net::NetworkDelegate* network_delegate,
-      net::ProxyConfigService* proxy_config_service,
+      scoped_ptr<net::ProxyConfigService> proxy_config_service,
       bool quick_check_enabled);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyServiceFactory);
 };
 
 }  // namespace ios
 
 #endif  // IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_