Change SigninClient::CreateGaiaAuthFetcher return type to unique_ptr

ios/chrome/browser/signin/signin_client_impl.mm

 // 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/signin/signin_client_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/guid.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/content_settings/core/browser/cookie_settings.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "components/metrics/metrics_service.h"
 #include "components/prefs/pref_service.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/signin_cookie_changed_subscription.h"
 #include "components/signin/core/browser/signin_header_helper.h"
 #include "components/signin/ios/browser/profile_oauth2_token_service_ios_provider.h"
 #include "google_apis/gaia/gaia_constants.h"
@@ skipping 200 matching lines @@
 
 void SigninClientImpl::DelayNetworkCall(const base::Closure& callback) {
   // Don't bother if we don't have any kind of network connection.
   if (net::NetworkChangeNotifier::IsOffline()) {
     delayed_callbacks_.push_back(callback);
   } else {
     callback.Run();
   }
 }
 
-GaiaAuthFetcher* SigninClientImpl::CreateGaiaAuthFetcher(
+std::unique_ptr<GaiaAuthFetcher> SigninClientImpl::CreateGaiaAuthFetcher(
     GaiaAuthConsumer* consumer,
     const std::string& source,
     net::URLRequestContextGetter* getter) {
-  return new GaiaAuthFetcherIOS(consumer, source, getter, browser_state_);
+  return base::MakeUnique<GaiaAuthFetcherIOS>(consumer, source, getter,
+                                              browser_state_);
 }