Move PrefRegistrySimple to use unique_ptr<Value>

components/network_time/network_time_tracker.cc

Index: components/network_time/network_time_tracker.cc
diff --git a/components/network_time/network_time_tracker.cc b/components/network_time/network_time_tracker.cc
index 71e6662d7de946006b6642eb1be5b2c7c63cc423..b5d8ccb853831daf89f93e1282e7386cd454ed17 100644
--- a/components/network_time/network_time_tracker.cc
+++ b/components/network_time/network_time_tracker.cc
@@ -11,6 +11,7 @@
 #include "base/i18n/time_formatting.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/rand_util.h"
@@ -189,7 +190,7 @@ void RecordFetchValidHistogram(bool valid) {
 // static
 void NetworkTimeTracker::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterDictionaryPref(prefs::kNetworkTimeMapping,
-                                   new base::DictionaryValue());
+                                   base::MakeUnique<base::DictionaryValue>());
 }
 
 NetworkTimeTracker::NetworkTimeTracker(