Move PrefRegistrySimple to use unique_ptr<Value>

chrome/browser/spellchecker/spellcheck_factory.cc

Index: chrome/browser/spellchecker/spellcheck_factory.cc
diff --git a/chrome/browser/spellchecker/spellcheck_factory.cc b/chrome/browser/spellchecker/spellcheck_factory.cc
index 3857256a3d4db0bbbb006dbbba973ef681f6b535..9d94c21c4201e347202dc186109c6a8d32ca46e5 100644
--- a/chrome/browser/spellchecker/spellcheck_factory.cc
+++ b/chrome/browser/spellchecker/spellcheck_factory.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/spellchecker/spellcheck_factory.h"
 
+#include "base/memory/ptr_util.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/spellchecker/spellcheck_service.h"
 #include "chrome/grit/locale_settings.h"
@@ -69,7 +70,7 @@ KeyedService* SpellcheckServiceFactory::BuildServiceInstanceFor(
 void SpellcheckServiceFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
   user_prefs->RegisterListPref(spellcheck::prefs::kSpellCheckDictionaries,
-                               new base::ListValue);
+                               base::MakeUnique<base::ListValue>());
   // Continue registering kSpellCheckDictionary for preference migration.
   // TODO(estade): IDS_SPELLCHECK_DICTIONARY should be an ASCII string.
   user_prefs->RegisterStringPref(