Re-write many calls to WrapUnique() with MakeUnique()

ios/chrome/browser/net/proxy_service_factory.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 "ios/chrome/browser/net/proxy_service_factory.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "components/proxy_config/pref_proxy_config_tracker_impl.h"
@@ skipping 11 matching lines @@
           web::WebThread::GetTaskRunnerForThread(web::WebThread::IO),
           web::WebThread::GetTaskRunnerForThread(web::WebThread::FILE)));
   return tracker->CreateTrackingProxyConfigService(std::move(base_service));
 }
 
 // static
 std::unique_ptr<PrefProxyConfigTracker>
 ProxyServiceFactory::CreatePrefProxyConfigTrackerOfProfile(
     PrefService* browser_state_prefs,
     PrefService* local_state_prefs) {
-  return base::WrapUnique(new PrefProxyConfigTrackerImpl(
+  return base::MakeUnique<PrefProxyConfigTrackerImpl>(
       browser_state_prefs,
-      web::WebThread::GetTaskRunnerForThread(web::WebThread::IO)));
+      web::WebThread::GetTaskRunnerForThread(web::WebThread::IO));
 }
 
 // static
 std::unique_ptr<PrefProxyConfigTracker>
 ProxyServiceFactory::CreatePrefProxyConfigTrackerOfLocalState(
     PrefService* local_state_prefs) {
-  return base::WrapUnique(new PrefProxyConfigTrackerImpl(
+  return base::MakeUnique<PrefProxyConfigTrackerImpl>(
       local_state_prefs,
-      web::WebThread::GetTaskRunnerForThread(web::WebThread::IO)));
+      web::WebThread::GetTaskRunnerForThread(web::WebThread::IO));
 }
 
 // static
 std::unique_ptr<net::ProxyService> ProxyServiceFactory::CreateProxyService(
     net::NetLog* net_log,
     net::URLRequestContext* context,
     net::NetworkDelegate* network_delegate,
     std::unique_ptr<net::ProxyConfigService> proxy_config_service,
     bool quick_check_enabled) {
   DCHECK_CURRENTLY_ON(web::WebThread::IO);
   std::unique_ptr<net::ProxyService> proxy_service(
       net::ProxyService::CreateUsingSystemProxyResolver(
           std::move(proxy_config_service), 0, net_log));
   proxy_service->set_quick_check_enabled(quick_check_enabled);
   return proxy_service;
 }
 
 }  // namespace ios