make ProxyService::CreateSystemProxyConfigService return scoped_ptrs NOT FOR REVIEW

ios/crnet/crnet_environment.mm

Index: ios/crnet/crnet_environment.mm
diff --git a/ios/crnet/crnet_environment.mm b/ios/crnet/crnet_environment.mm
index c8650cb0483aefc12390c79bc7e11c6ccc3d2d3f..9551102bb7b0a8c6ec9dbc5df1455efb799f9b63 100644
--- a/ios/crnet/crnet_environment.mm
+++ b/ios/crnet/crnet_environment.mm
@@ -282,8 +282,8 @@ void CrNetEnvironment::Install() {
   // 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,
@@ -408,7 +408,7 @@ void CrNetEnvironment::InitializeOnNetworkThread() {
           .release());
   main_context_->set_proxy_service(
       net::ProxyService::CreateUsingSystemProxyResolver(
-          proxy_config_service_.get(), 0, nullptr)
+          proxy_config_service_.Pass(), 0, nullptr)
           .release());
 
   // Cache