make ProxyService::CreateSystemProxyConfigService return scoped_ptrs NOT FOR REVIEW

ios/crnet/crnet_environment.mm

 // Copyright 2014 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 "ios/crnet/crnet_environment.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
@@ skipping 264 matching lines @@
   file_thread_->StartWithOptions(
       base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
   file_user_blocking_thread_.reset(
       new base::Thread("Chrome File User Blocking Thread"));
   file_user_blocking_thread_->StartWithOptions(
       base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
 
   // The network change notifier must be initialized so that registered
   // delegates will receive callbacks.
   network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
-  proxy_config_service_.reset(net::ProxyService::CreateSystemProxyConfigService(
-      network_io_thread_->task_runner(), nullptr));
+  proxy_config_service_ = net::ProxyService::CreateSystemProxyConfigService(
+      network_io_thread_->task_runner(), nullptr);
 
   PostToNetworkThread(FROM_HERE,
       base::Bind(&CrNetEnvironment::InitializeOnNetworkThread,
                  base::Unretained(this)));
 
   net::SetURLRequestContextForNSSHttpIO(main_context_.get());
   main_context_getter_ = new CrNetURLRequestContextGetter(
       main_context_.get(), network_io_thread_->task_runner());
   SetRequestFilterBlock(nil);
 }
@@ skipping 104 matching lines @@
   main_context_->set_host_resolver(
       net::HostResolver::CreateDefaultResolver(nullptr).release());
   main_context_->set_cert_verifier(
       net::CertVerifier::CreateDefault().release());
   main_context_->set_http_auth_handler_factory(
       net::HttpAuthHandlerRegistryFactory::CreateDefault(
           main_context_->host_resolver())
           .release());
   main_context_->set_proxy_service(
       net::ProxyService::CreateUsingSystemProxyResolver(
-          proxy_config_service_.get(), 0, nullptr)
+          proxy_config_service_.Pass(), 0, nullptr)
           .release());
 
   // Cache
   NSArray* dirs = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,
                                                       NSUserDomainMask,
                                                       YES);
   base::FilePath cache_path =
       base::mac::NSStringToFilePath([dirs objectAtIndex:0]);
   cache_path = cache_path.Append(FILE_PATH_LITERAL("crnet"));
   net::HttpCache::DefaultBackend* main_backend =
@@ skipping 81 matching lines @@
       if (backend)
         backend->DoomAllEntries(client_callback);
   });
   int rc = cache->GetBackend(&backend, doom_callback);
   if (rc != net::ERR_IO_PENDING) {
     // GetBackend doesn't call the callback if it completes synchronously, so
     // call it directly here.
     doom_callback.Run(rc);
   }
 }