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

ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm

Index: ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
diff --git a/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm b/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
index 514b08c787e7fd66b9791f6a47da6edf1d094019..1337ab2c92b998542a0eafcfcedb0d0a297e4399 100644
--- a/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
+++ b/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
@@ -6,6 +6,7 @@
 
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "components/metrics/metrics_state_manager.h"
 #include "components/prefs/pref_service.h"
 #include "components/rappor/rappor_service.h"
@@ -23,8 +24,8 @@ namespace {
 
 void PostStoreMetricsClientInfo(const metrics::ClientInfo& client_info) {}
 
-scoped_ptr<metrics::ClientInfo> LoadMetricsClientInfo() {
-  return scoped_ptr<metrics::ClientInfo>();
+std::unique_ptr<metrics::ClientInfo> LoadMetricsClientInfo() {
+  return std::unique_ptr<metrics::ClientInfo>();
 }
 
 }  // namespace
@@ -38,14 +39,14 @@ IOSChromeMetricsServicesManagerClient::IOSChromeMetricsServicesManagerClient(
 IOSChromeMetricsServicesManagerClient::
     ~IOSChromeMetricsServicesManagerClient() = default;
 
-scoped_ptr<rappor::RapporService>
+std::unique_ptr<rappor::RapporService>
 IOSChromeMetricsServicesManagerClient::CreateRapporService() {
   DCHECK(thread_checker_.CalledOnValidThread());
-  return make_scoped_ptr(new rappor::RapporService(
+  return base::WrapUnique(new rappor::RapporService(
       local_state_, base::Bind(&::IsOffTheRecordSessionActive)));
 }
 
-scoped_ptr<variations::VariationsService>
+std::unique_ptr<variations::VariationsService>
 IOSChromeMetricsServicesManagerClient::CreateVariationsService() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
@@ -53,12 +54,12 @@ IOSChromeMetricsServicesManagerClient::CreateVariationsService() {
   // a dummy value for the name of the switch that disables background
   // networking.
   return variations::VariationsService::Create(
-      make_scoped_ptr(new IOSChromeVariationsServiceClient), local_state_,
+      base::WrapUnique(new IOSChromeVariationsServiceClient), local_state_,
       GetMetricsStateManager(), "dummy-disable-background-switch",
       ::CreateUIStringOverrider());
 }
 
-scoped_ptr<metrics::MetricsServiceClient>
+std::unique_ptr<metrics::MetricsServiceClient>
 IOSChromeMetricsServicesManagerClient::CreateMetricsServiceClient() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return IOSChromeMetricsServiceClient::Create(GetMetricsStateManager(),