Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h

Index: ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h
diff --git a/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h b/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h
index f2a9f8d3f9d64219215e503565e134a9fae3f5bf..f0014a37532f004f69205efed2b958f6c0f5305e 100644
--- a/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h
+++ b/ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h
@@ -7,11 +7,11 @@
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "components/metrics/metrics_service_client.h"
@@ -44,7 +44,7 @@ class IOSChromeMetricsServiceClient
   ~IOSChromeMetricsServiceClient() override;
 
   // Factory function.
-  static scoped_ptr<IOSChromeMetricsServiceClient> Create(
+  static std::unique_ptr<IOSChromeMetricsServiceClient> Create(
       metrics::MetricsStateManager* state_manager,
       PrefService* local_state);
 
@@ -65,7 +65,7 @@ class IOSChromeMetricsServiceClient
   void InitializeSystemProfileMetrics(
       const base::Closure& done_callback) override;
   void CollectFinalMetricsForLog(const base::Closure& done_callback) override;
-  scoped_ptr<metrics::MetricsLogUploader> CreateUploader(
+  std::unique_ptr<metrics::MetricsLogUploader> CreateUploader(
       const base::Callback<void(int)>& on_upload_complete) override;
   base::TimeDelta GetStandardUploadInterval() override;
   base::string16 GetRegistryBackupKey() override;
@@ -120,7 +120,7 @@ class IOSChromeMetricsServiceClient
   metrics::MetricsStateManager* metrics_state_manager_;
 
   // The MetricsService that |this| is a client of.
-  scoped_ptr<metrics::MetricsService> metrics_service_;
+  std::unique_ptr<metrics::MetricsService> metrics_service_;
 
   // The IOSChromeStabilityMetricsProvider instance that was registered with
   // MetricsService. Has the same lifetime as |metrics_service_|.
@@ -144,12 +144,12 @@ class IOSChromeMetricsServiceClient
   const base::TimeTicks start_time_;
 
   // Subscription for receiving callbacks that a tab was parented.
-  scoped_ptr<base::CallbackList<void(web::WebState*)>::Subscription>
+  std::unique_ptr<base::CallbackList<void(web::WebState*)>::Subscription>
       tab_parented_subscription_;
 
   // Subscription for receiving callbacks that a URL was opened from the
   // omnibox.
-  scoped_ptr<base::CallbackList<void(OmniboxLog*)>::Subscription>
+  std::unique_ptr<base::CallbackList<void(OmniboxLog*)>::Subscription>
       omnibox_url_opened_subscription_;
 
   // Whether this client has already uploaded profiler data during this session.