Remove EmptyRuleIterators with nullptrs.

chrome/browser/content_settings/content_settings_origin_identifier_value_map_unittest.cc

Index: chrome/browser/content_settings/content_settings_origin_identifier_value_map_unittest.cc
diff --git a/chrome/browser/content_settings/content_settings_origin_identifier_value_map_unittest.cc b/chrome/browser/content_settings/content_settings_origin_identifier_value_map_unittest.cc
index 7ac0d445d623252e2b7a363407b64b536939bf7e..5c56b1ccb70118ac3e84e904d6f14d608ada502d 100644
--- a/chrome/browser/content_settings/content_settings_origin_identifier_value_map_unittest.cc
+++ b/chrome/browser/content_settings/content_settings_origin_identifier_value_map_unittest.cc
@@ -174,8 +174,9 @@ TEST(OriginIdentifierValueMapTest, ListEntryPrecedences) {
 TEST(OriginIdentifierValueMapTest, IterateEmpty) {
   content_settings::OriginIdentifierValueMap map;
   std::unique_ptr<content_settings::RuleIterator> rule_iterator(
-      map.GetRuleIterator(CONTENT_SETTINGS_TYPE_COOKIES, std::string(), NULL));
-  EXPECT_FALSE(rule_iterator->HasNext());
+      map.GetRuleIterator(CONTENT_SETTINGS_TYPE_COOKIES, std::string(),
+                          nullptr));
+  EXPECT_FALSE(rule_iterator);
 }
 
 TEST(OriginIdentifierValueMapTest, IterateNonempty) {