SigninStatusMetricsProvider factory returns a std::unique_ptr<>.

components/signin/core/browser/signin_status_metrics_provider.cc

 // 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 "components/signin/core/browser/signin_status_metrics_provider.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/signin/core/browser/signin_manager.h"
 
 SigninStatusMetricsProvider::SigninStatusMetricsProvider(
     std::unique_ptr<SigninStatusMetricsProviderDelegate> delegate,
     bool is_test)
     : delegate_(std::move(delegate)),
       scoped_observer_(this),
@@ skipping 17 matching lines @@
     metrics::ChromeUserMetricsExtension* uma_proto) {
   RecordSigninStatusHistogram(signin_status());
   // After a histogram value is recorded, a new UMA session will be started, so
   // we need to re-check the current sign-in status regardless of the previous
   // recorded |signin_status_| value.
   ResetSigninStatus();
   ComputeCurrentSigninStatus();
 }
 
 // static
-SigninStatusMetricsProvider* SigninStatusMetricsProvider::CreateInstance(
+std::unique_ptr<SigninStatusMetricsProvider>
+SigninStatusMetricsProvider::CreateInstance(
     std::unique_ptr<SigninStatusMetricsProviderDelegate> delegate) {
-  return new SigninStatusMetricsProvider(std::move(delegate), false);
+  return base::WrapUnique(
+      new SigninStatusMetricsProvider(std::move(delegate), false));
 }
 
 void SigninStatusMetricsProvider::OnSigninManagerCreated(
     SigninManagerBase* manager) {
   // Whenever a new profile is created, a new SigninManagerBase will be created
   // for it. This ensures that all sign-in or sign-out actions of all opened
   // profiles are being monitored.
   scoped_observer_.Add(manager);
 
   // If the status is unknown, it means this is the first created
@@ skipping 86 matching lines @@
 void SigninStatusMetricsProvider::UpdateInitialSigninStatusForTesting(
     size_t total_count,
     size_t signed_in_profiles_count) {
   UpdateInitialSigninStatus(total_count, signed_in_profiles_count);
 }
 
 SigninStatusMetricsProvider::SigninStatus
 SigninStatusMetricsProvider::GetSigninStatusForTesting() {
   return signin_status();
 }