Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

extensions/common/extension_api.cc

Index: extensions/common/extension_api.cc
diff --git a/extensions/common/extension_api.cc b/extensions/common/extension_api.cc
index 1fee5b3c8b272719f2db9108d0288ec63655c8fc..8430a2fb117dead341b92dc8d8790f75196aeffc 100644
--- a/extensions/common/extension_api.cc
+++ b/extensions/common/extension_api.cc
@@ -132,8 +132,8 @@ void PrefixRefsWithNamespace(const std::string& schema_namespace,
   base::ListValue* list = NULL;
   base::DictionaryValue* dict = NULL;
   if (value->GetAsList(&list)) {
-    for (base::ListValue::iterator i = list->begin(); i != list->end(); ++i) {
-      PrefixRefsWithNamespace(schema_namespace, *i);
+    for (const auto& i : *list) {
+      PrefixRefsWithNamespace(schema_namespace, i.get());
     }
   } else if (value->GetAsDictionary(&dict)) {
     MaybePrefixFieldWithNamespace(schema_namespace, dict, "$ref");