SigninStatusMetricsProvider factory returns a std::unique_ptr<>.

components/signin/core/browser/signin_status_metrics_provider.h

 // 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.
 
 #ifndef COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_STATUS_METRICS_PROVIDER_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_STATUS_METRICS_PROVIDER_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 19 matching lines @@
 class SigninStatusMetricsProvider : public SigninStatusMetricsProviderBase,
                                     public SigninManagerBase::Observer {
  public:
   ~SigninStatusMetricsProvider() override;
 
   // SigninStatusMetricsProviderBase:
   void ProvideGeneralMetrics(
       metrics::ChromeUserMetricsExtension* uma_proto) override;
 
   // Factory method, creates a new instance of this class.
-  static SigninStatusMetricsProvider* CreateInstance(
+  static std::unique_ptr<SigninStatusMetricsProvider> CreateInstance(
       std::unique_ptr<SigninStatusMetricsProviderDelegate> delegate);
 
   // Update the sign-in status when a SigninManager is created.
   void OnSigninManagerCreated(SigninManagerBase* manager);
 
   // Update the sign-in status when a SigninManager is shut down.
   void OnSigninManagerShutdown(SigninManagerBase* manager);
 
   // Updates the initial sign-in status. For testing purpose only.
   void UpdateInitialSigninStatusForTesting(size_t total_count,
@@ skipping 46 matching lines @@
 
   // Whether the instance is for testing or not.
   bool is_test_;
 
   base::WeakPtrFactory<SigninStatusMetricsProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninStatusMetricsProvider);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_STATUS_METRICS_PROVIDER_H_